QA問答：如果鉆石是最硬的材料，我們?yōu)槭裁床挥勉@石做防彈背心呢？
If diamond is the hardest material, why don''t we make bulletproof vests out of diamond?
譯文簡介
網(wǎng)友：鉆石是最硬的材料，如果你用它沿著一片玻璃劃一道線，你就可以沿著這條劃的線將玻璃折斷。但是，如果你試著用錘子砸鉆石。天哪，它會(huì)碎掉，因?yàn)樗娴?，真的很脆?，F(xiàn)在想象一下用子彈打它（鉆石）會(huì)怎么樣.
正文翻譯
If diamond is the hardest material, why don't we make bulletproof vests out of diamond?
如果鉆石是最硬的材料，我們?yōu)槭裁床挥勉@石做防彈背心呢？
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Well, mainly because they’d be fucking rubbish.
Yes, diamond is the hardest material. That’s great if you want to drag it along a sheet of glass so you can snap it cleanly along the score line.
However, try hitting it with a hammer. Oh dear, it shattered, because it’s really, really brittle. Now imagine hitting it with a bullet.
主要是因?yàn)樗麄兌己芾?br /> 是的，鉆石是最硬的材料，如果你用它沿著一片玻璃劃一道線，你就可以沿著這條劃的線將玻璃折斷。
但是，如果你試著用錘子砸鉆石。天哪，它會(huì)碎掉，因?yàn)樗娴?，真的很脆?，F(xiàn)在想象一下用子彈打它（鉆石）會(huì)怎么樣。
I hit a sheet of clingfilm (saranwrap in the US?) and a sheet of glass with a hammer. The glass shattered but the clingfilm was ok. Therefore clingfilm is tougher than glass so why aren't car windscreens and phone screens made of clingfilm?
* This is not a serious question.
我用錘子敲了一塊保鮮膜（美國的saranwrap？）和一塊玻璃。玻璃碎了，但保鮮膜還是好的。
因此，保鮮膜比玻璃更堅(jiān)固，那么為什么汽車擋風(fēng)玻璃和手機(jī)屏幕不是由保鮮膜制成的呢？
這不是一個(gè)嚴(yán)謹(jǐn)?shù)膯栴}。
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Because you’re asking a different question?
(Which you probably know)
Hard and Tough are measures of different things.
Diamonds are hard but not very tough.
Rubber is tough but not very hard.
因?yàn)槟銌柫艘粋€(gè)不同的問題？
（你可能知道）
“硬度”和“韌性”是衡量不同事物的標(biāo)準(zhǔn)。
鉆石很硬，但韌性不足。
橡膠很有韌性，但硬度不夠。
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The rubber windshield never really got an industry foothold. The inventor didn't have a broad vision for his product.
橡膠擋風(fēng)玻璃從未真正在行業(yè)中站穩(wěn)腳跟，用橡膠做成的產(chǎn)品沒有開闊的視野。
I don’t trust the rubber windshield companies. There’s a distinct lack of transparency.
我不相信那些做橡膠擋風(fēng)玻璃的公司，顯然做出來的產(chǎn)品缺乏透明度。
Well they sort of are … in your car windscreen between two sheets of glass is a transparent plastic layer. The glass is hard and the plastic tough. The combination is both.
在你的汽車擋風(fēng)玻璃的兩層玻璃之間是一層透明的塑料層。玻璃很硬，塑料很堅(jiān)韌。兩者的結(jié)合。
Very true. It’s laminated glass.
的確如此，這是夾層玻璃。
Actually it is a very serious question. Beyond the ‘because they don’t work’ answer lies an entire science of materials and their applications.
事實(shí)上，這是一個(gè)非常嚴(yán)肅的問題。除了“因?yàn)樗鼈儾黄鹱饔谩边@個(gè)答案之外，這其中還涉及到一門關(guān)于材料及其應(yīng)用的完整科學(xué)。
I remember at school when we were taught the issue of hardness, toughness and other attributes of materials.
我記得在學(xué)校里，老師教我們硬度、韌性還有其他一些材料的屬性。
When I was at school, the issue of hardness and toughness came down to how hard you could punch someone in the face, and how much you could take the punch.
I think things have probably moved on
當(dāng)我還在學(xué)校的時(shí)候，硬度和韌性的問題歸結(jié)為你能把一個(gè)人的臉打的多狠，以及你能承受多大的打擊。我想事情可能已經(jīng)發(fā)生了變化
By the time I left high school, I had dropped back down to fights per week, and death threats received per month.
I think I’m now down to about a fight per month and death threats per year.
到我高中畢業(yè)的時(shí)候，我每周都在打架，每個(gè)月都收到死亡威脅。
我想我現(xiàn)在每個(gè)月都有一場打架，每年都有死亡威脅。
Interestingly, a much softer form of carbon (carbon fiber) can be used as a component of armor because of its flexibility and tensile strength.
有趣的是，一種更柔軟的碳（碳纖維）可以作為盔甲的組成部分，因?yàn)樗泻芨叩娜犴g性和抗拉強(qiáng)度。
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Or mix it with a lot of iron and make high carbon steel. Tough. Bullet proof. Recyclable.
或者把它和大量的鐵混合，制成高碳鋼，很堅(jiān)固，防彈，也可以回收利用。
Heavy, though. Prone to rusting as well without treatment.
In F1, the chassis, bodywork and even the whole survival cell is made from Carbon Fibre. Hell, so are the drivers’ helmets!
不過，這應(yīng)該很重，不經(jīng)過處理也容易生銹。
在F1中，底盤、車身甚至整個(gè)零部件單元都是由碳纖維制成的。
司機(jī)的頭盔也是一樣！
That is why we have steel alloys like Corten and Stainless steel.
Most driver helmets are actually made from fiberglass and epoxy or polycarbonate. You really do not want the latter except when doing BMX or another bicycle related sports as they are very bad at protection with high speeds. Practically every bicycle helmet is made from polycarbonate and will give absolutely zero protection against a speeding car. There is no use for them in normal life except to look extremely stupid.
這就是為什么我們有耐候鋼和不銹鋼等合金鋼。
大多數(shù)駕駛員頭盔實(shí)際上是由玻璃纖維和環(huán)氧樹脂或聚碳酸酯制成的。你真的不會(huì)想要后者，除非做BMX或其他與自行車相關(guān)的運(yùn)動(dòng)，因?yàn)樗麄冊诟咚贂r(shí)保護(hù)能力很差。幾乎每一個(gè)自行車頭盔都是由聚碳酸酯制成的，對于超速的汽車完全沒有任何保護(hù)作用。在正常生活中，他們除了看起來極其愚蠢之外沒有任何用處。
Umm, one prent vest material includes ceramic, which shatters when hit by a bullet.
The problem with diamond is the fact that it WOULDN’T shatter, which would impart the impact of the bullet into the user, even if the bullet didn’t penetrate. It would likely cause an internal hemorrhage, possibly fatal.
一種流行的背心材料是陶瓷，被子彈擊中會(huì)碎。鉆石的問題在于它不會(huì)破碎，這將會(huì)將子彈的沖擊力傳遞給使用者，即使子彈沒有穿透，可能會(huì)引起內(nèi)出血，甚至致命。
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Body armour plates have ceramic layers, which absorb energy by crushing. Those are alternated with layers of polymer or metal, which deform and hold the thing together. A pure ceramic plate would just disintegrate and let the bullet through. So would diamond. A bullet will easily shatter diamond.
防彈衣有陶瓷層，通過粉碎吸收能量。它們與聚合物或金屬層交替使用，這些聚合物或金屬層會(huì)變形并將物體固定在一起。一個(gè)純陶瓷板會(huì)解體，讓子彈穿過。鉆石也是如此，子彈能夠輕易地粉碎鉆石。
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Right, it absolutely would. That doesn’t mean that it will be able to penetrate skin beneath that layer of diamond on the first shot. The first shot would shatter it, but it would likely take a follow up shot to do any damage. It’s brittle but has a high yield strength, so until it’s already shattered, it would provide good protection.
是的，絕對會(huì)。這并不意味著它能在第一次射擊時(shí)穿透鉆石層下面的皮膚。第一槍會(huì)把它擊碎，但可能要再開一槍才能造成傷害。鉆石很脆，但有很高的屈服強(qiáng)度，所以在它破碎之前，它可以提供很好的保護(hù)。
It depends. If it hit a sheet of diamond, you may get away with a single strike without significant injury. It’s brittle, but that first impact would not be as easy as breaking it with a hammer. It would be as easy as hitting it with a hammer and expecting that hammerhead to make contact with the ground below it on the first blow—just not going to happen until you first shatter it.
If you had armor made of thousands of diamonds embedded in a normal cloth material, yes, the bullet would probably transfer enough of it’s momentum to be akin to just striking you directly. If you had a sheet of it, though, that momentum is going to spread out and dissipate in all directions and as I suggest, you might end up being okay for one shot.
視情況而定，如果擊中了一塊鉆石，你可能只命中一擊而不會(huì)受重傷。鉆石很脆，但第一次撞擊不會(huì)像用錘子那樣容易打碎它。這就好像用錘子擊打它，并期望錘頭在第一次擊打時(shí)就能接觸到地面一樣簡單——但在你第一次擊碎它之前，這是不可能發(fā)生的。
如果你的盔甲是由數(shù)千顆鉆石鑲嵌在一個(gè)普通的布料材料中，是的，子彈可能會(huì)轉(zhuǎn)移足夠的動(dòng)量，就像直接擊中你一樣。但如果你有一張紙，動(dòng)量會(huì)向四面八方擴(kuò)散消散，就像我建議的那樣，你可能會(huì)在一次射擊中就結(jié)束生命。
So being shot while wearing diamond body armour would result in one bullet would and probably dozens of diamond shrapnel wounds? It sounds only marginally better than wearing body armour made from live landmines.
所以穿著鉆石防彈衣中槍只會(huì)造成一顆子彈可能還有幾十處鉆石彈片傷？這聽起來只比穿著用地雷制成的防彈衣好一點(diǎn)點(diǎn)。
And as someone else stated, they burn. First thing British troops in Northern Ireland were told was “Do NOT do up the zip on a flak jacket”. Nylon also melts, and makes it impossible to remove in the event of being hit by a petrol bomb.
就像其他人說的，他們會(huì)燃燒。在北愛爾蘭的英國軍隊(duì)被告知的第一件事是“不要把防彈衣的拉鏈拉上”。尼龍也會(huì)融化，這使得它在被汽油彈擊中時(shí)無法被移除。
To be fair, nylon burns a lot more easily than diamonds.
公平地說，尼龍比鉆石更容易燃燒。
The prime reason that Velcro fastenings made an appearance in the 1970s.
這就是維可牢尼龍搭扣（是由瑞士發(fā)明家喬治發(fā)明的）在20世紀(jì)70年代出現(xiàn)的主要原因。
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Ceramics behave in the same manner, yet they are part of the most advanced types of passive armor. You are completely right about the fact that diamond by itself would suck as armor, but it may be part of a relatively efficient armor system (though probably not efficient from a price perspective).
陶瓷也是如此，但它們是最先進(jìn)的盔甲的一部分。你說的完全正確，鉆石本身作為盔甲就很糟糕，但它可能是相對有效的盔甲系統(tǒng)的一部分（盡管從價(jià)格角度來看可能并不有效）。
my diamond bulletproof vest is fireproof but it cost $4 million. My wife is very angry with me for buying it.
我的鉆石防彈背心是防火的，但它花了我四百萬美元。我妻子因?yàn)槲屹I了它而對我很生氣。
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Diamonds are carbon, they are not fire-proof.
鉆石是碳元素組成的，它們不耐火。
At 763 degrees Celsius, sure diamonds will burn.
在763攝氏度，鉆石肯定會(huì)燃燒。
There is a very noticeable difference between “hard” and “strong.”
“硬”和“強(qiáng)”之間有一個(gè)非常明顯的區(qū)別。
At least when you die you have a way to pay for the funeral.
至少當(dāng)你死的時(shí)候你有辦法支付葬禮的費(fèi)用。
Diamond is not even a metal. It’s carbon…
鉆石甚至不是金屬，它是碳…
Yes, I know.
是的，我明白。
I guess technically, Lonsdaleite is a diamond with a different crystalline structure, but someone chose to give it a different name. But it is generally half again as “strong” as diamond.
我想從技術(shù)上講，Lonsdaleite是一種晶體結(jié)構(gòu)不同的鉆石，但有人給它取了個(gè)不同的名字。但一般來說，它的“強(qiáng)度”是鉆石的一半。
Besides, it is going to be very very expensive.
而且，它非常非常的貴。
Did the OP say diamond is the hardest METAL?
鉆石是最硬的金屬嗎？
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Well, to astronomers, everything above helium in the table of elements is called a metal.
對天文學(xué)家來說，元素表里除氦以外的一切都被稱為金屬
Using a hammer will chip (not break) a quality diamond. A chipped diamond can be fixed.
使用錘子會(huì)使高質(zhì)量的鉆石碎裂（而不是折斷），脫落的鉆石可以修復(fù)。
Slightly "off topic", but apparently when Tsar Nicholas and his family were murdered in 1918, some of his daughters didn't die in the fusillade of bullets, as they'd stitched the families jewellery into their underclothes. This deflected the bullets and they had to be finished off with bayonets!
雖然有點(diǎn)跑題，但很明顯，當(dāng)沙皇尼古拉斯和他的家人在1918年被謀殺時(shí)，他的一些女兒并沒有死于槍林彈雨下，因?yàn)樗齻儼鸭易宓闹閷毧p進(jìn)了她們的內(nèi)衣里。這使子彈偏離了方向，他們不得不用刺刀來干掉他們！
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The way I saw it explained (in a YouTube video, no less), which helped, was via an analogy:
You can make a mark on wood by scratching it with glass. So glass is harder than wood.
However, you can break a glass window by hitting it with a wooden baseball bat. So glass is more brittle than wood.
通過一個(gè)類比，我看到了一個(gè)很有幫助的解釋（至少是在YouTube視頻中）:
你可以用玻璃在木頭上劃個(gè)記號，所以玻璃比木頭硬。
然而，你可以用木制棒球棒擊碎玻璃窗，所以玻璃比木頭更易碎。
That’s why a diamond cutter needs nerves of steel. Cut a diamond in the wrong place and it will shatter ruining its value.
這就是為什么鉆石切割師需要鋼鐵般的意志。因?yàn)殂@石切錯(cuò)了地方就會(huì)破碎，失去價(jià)值。
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There is a great misunderstanding between harness and toughness. Diamonds are very hard, but they're not very tough, meaning they cannot absorb a lot of energy before fracture. Contrast that to ballistic fibers which are considerably more tough, and enhanced moreso by the weave of the fabric, allowing for even more energy absorption. In most applications, it's not one singular property that makes a material most suitable, but a balance of many.
硬度和韌性之間存在很大的誤解。鉆石很硬，但沒有韌性，這意味著它們在受到?jīng)_擊時(shí)不能吸收大量能量。相比之下，彈道纖維是相當(dāng)堅(jiān)韌，并通過編制這種纖維使其更加具有韌性，能夠吸收更多的能量。在大多數(shù)應(yīng)用中，選用合適的材料并不是看它的單一屬性，而是多種屬性的平衡。
Imagine how much a vest made of diamond would weigh, it be like wearing a boat anchor around.
想象一下，一件鉆石做的背心有多重，它就像戴著一個(gè)船錨一樣。
Its a crystal. Crystals have natural fracture lines. If hit at the right angle they will split.
它是晶體，晶體有天然的斷裂線，如果以正確的角度撞擊，它們會(huì)分裂。
One diamond bullet proof vest is worth more than all your internal organs
一件鉆石防彈背心比你所有的內(nèi)臟都值錢
Thats like asking why dont we make electrical wire out of gold since its a better conductor than copper? Well simply because its way too expensive.
這就像問為什么我們不用金做電線，因?yàn)榻鸬膶?dǎo)體比銅好？很簡單，因?yàn)樗F了。
Diamond is not a metal.
鉆石不是金屬。
Diamond is not a metal.
鉆石不是金屬。
Because hardness isn't nearly as important as toughness and strength when it comes to something like a bulletproof vest. Hardness is an obxt's ability to resist scratches and similar damage. Toughness is an obxt's ability to deform without breaking. Strength is an obxt's ability to resist deforming in the first place.
It's much more important that a bulletproof vest minimizes deformations and absolutely doesn't fracture what hit by a bullet
因?yàn)閷τ诜缽棻承倪@樣的東西來說，硬度遠(yuǎn)不如韌性和強(qiáng)度那么重要。硬度是物體抵抗劃痕和類似損傷的能力。韌性是一個(gè)物體變形而不折斷的能力。強(qiáng)度首先是物體抵抗變形的能力。
更重要的是，一件防彈背心能最大限度地減少變形，而且絕對不會(huì)讓子彈擊中的物體破碎。
Diamond is not a metal!!!
its carbon crystal
carbon is not a metal
鉆石不是金屬??！
它是碳晶體
碳不是金屬
are you sure? It is difficult to break a diamond
你確定嗎？鉆石是很難打碎的
First, diamond is not a metal. It is crystallized carbon.
Second, you are misunderstanding the concept of “hardness”. It merely means the ability to cut or scratch other materials. Diamond can cut all other known substances, thus it is the “hardest” natural material known. Diamonds are crystals, and are actually pretty tough, but while not overly brittle they can be crushed or shattered. They will withstand a lot of shock treatment if flawless, but they can be easily smashed with a tack hammer. At the same time they are many times harder than the hammer’s metal.
Even if crystallized carbon, diamond, could be formed into the shape of a vest, or if a vest could be made of thousands of diamond crystals, the shock of a bullet striking it would smash it into a thousand shards. It would offer almost no resistance to a bullet, much less than plate glass. Therefore, a vest of diamond would be a very expensive but utterly impractical idea.
首先，鉆石不是金屬，它是結(jié)晶碳。
第二，你誤解了“硬度”的概念。它僅僅意味著切割或刮傷其他材料的能力。鉆石能切割其他所有已知物質(zhì)，因此它是已知的“最硬”的天然物質(zhì)。鉆石是晶體，實(shí)際上非常堅(jiān)硬，但雖然不是太脆，它們也可以被壓碎或粉碎。如果要把鉆石做的完美無瑕，它們將經(jīng)受住大量的電擊處理，但它們很容易被釘錘砸碎。同時(shí)，它們要比金屬做的錘子堅(jiān)硬許多倍。
即使鉆石是碳化結(jié)晶，但可以做成一件背心的形狀，或者如果一件背心可以由成千上萬的鉆石晶體制成，子彈擊中它的沖擊波會(huì)把它擊成碎片。它對子彈的抵抗力幾乎為零，比平板玻璃小得多。因此，一件鉆石背心將是一個(gè)非常昂貴但完全不切實(shí)際的想法。
Diamond isn't a metal and bulletproof vests aren't either.
Even if you would make a bulletproof vest from diamond it would shatter. Diamond is hard but VERY weak and brittle, like stale bread.
鉆石不是金屬，防彈背心也不是。
即使你用鉆石做防彈背心，它也會(huì)被擊的粉碎。鉆石很硬，但很脆易碎，就像不新鮮的面包。
Imagine you have a glass in your hand, you can easily crush it with your hand but shards are hard enough to cut your skin. The deal with the Diamond is somewhat same. It can shatter rather easily but it's hard enough to cut through any other material.
想象一下，你手里拿著一個(gè)玻璃杯，你可以很容易地用手捏碎它，但碎片的硬度足以劃破你的皮膚。鉆石也一樣，它可以很容易地被打的粉碎，但它的硬度足以穿透任何其他材料。
The salient point of a vest is to absorb impact and dissipate energy. Diamonds would transfer that energy rather than absorb it. I’ll stick with Kevlar.
背心的重點(diǎn)是吸收沖擊和消散能量。鉆石會(huì)轉(zhuǎn)移而不是吸收能量。我還是用凱夫拉纖維吧。
A diamond is one of the hardest known substances. ... A bullet can easily shatter a diamond. A bullet would have more trouble shattering your arm than a diamond (unless it was a very big diamond. Then it might stop a bullet.
鉆石是已知最堅(jiān)硬的物質(zhì)之一....子彈可以輕易地打碎鉆石。相比一顆子彈，一顆鉆石更容易打碎你的手臂（除非是一顆非常大的鉆石）。那它可能會(huì)擋住子彈。
If diamond is the hardest metal, why don't we make bulletproof vests out of diamond?
There is already diamond bulletproof vests (DBPV). Its just very expensive, $2.8 million - $3.2 million, so its not practical when there are bulletproof vests for cheaper. The DBPV is encrusted with 880 black diamonds and its carat weight is over 140.
如果鉆石是最硬的金屬，我們?yōu)槭裁床挥勉@石做防彈背心呢？
已經(jīng)有了鉆石防彈衣。只是價(jià)格很貴，280萬到320萬美元，所以當(dāng)有更便宜的防彈背心時(shí)，這種鉆石防彈背心是不實(shí)用的。DBPV鑲嵌著880顆黑鉆，其重量超過140克拉。
Diamonds are hardest element so it can scratch or cut into other elements.
It can not take impact - a soft hit with a hammer will shatter a diamond.
Same will happen with a bullet.
Also - bullet proof vest with diamonds will cost a lot…..
鉆石是最堅(jiān)硬的物質(zhì)，所以它可以劃傷或切割其他材料。
它不能承受沖擊——用錘子輕擊會(huì)粉碎鉆石。
同樣，用子彈擊中鉆石，鉆石也會(huì)粉碎。
另外——用鉆石做防彈背心會(huì)花費(fèi)很多錢.....
Diamond is a rare material and a very expensive one at that you can imagine how much would It take just to make one vest thick enough for use
鉆石是一種稀有的材料，也是一種非常昂貴的材料，你可以想象僅僅做一件足夠厚的背心需要多少錢
Diamond isn’t metal.
diamond is hard, relative to other material, but its also brittle. Brittle doesn’t make good shielding.
鉆石不是金屬。
與其他材料相比，鉆石很硬，但也很脆。脆性材料在防護(hù)方面并不突出。
Diamond is not the hardest metal. It is not even a metal being composed entirely of carbon (the same stuff in a pencil).
The hardness here is inability to be scratched by another substance. It does not define tensile strength or other common understandings of what it means to be hard.
If such a thing was made of diamond and hit by a bullet it would shatter into tiny pieces.
Better using kevlar or ceramics as bulletproofing.
鉆石不是最硬的金屬。它甚至不是一種完全由碳組成的金屬（鉛筆里也含有碳）。
這里的硬度是指不能被其他物質(zhì)劃傷。它沒有定義抗拉強(qiáng)度或其他關(guān)于硬度的常見理解。
如果這種東西是由鉆石制成的，然后被子彈擊中，它就會(huì)碎成小碎片。
最好是用凱夫拉纖維或陶瓷做防彈材料。
Diamond isn't a metal first of all.
It is very expensive though. Millions of dollars per vest. Not very cost efficient.
首先，鉆石不是金屬。
不過它很貴，每件背心價(jià)值數(shù)百萬美元，不是很劃算。
Being strong and being hard are two different qualities. Diamond is hard because no other material can make a scratch on it. Diamond is not strong. A 5 year old child can break it with a hammer.
強(qiáng)度和硬度是兩種不同的屬性。鉆石之所以堅(jiān)硬，是因?yàn)闆]有其他材料能在它上面留下劃痕。鉆石比較脆，一個(gè)5歲的孩子可以用錘子把它敲碎。
why diamond is not used for making bulletproof vests.
Brittle. Yes, diamond even though hard, is brittle. It shatters like glass on hard impact.
Cost and availability. We don't want to use a material which is costly and not available in huge quantities. Even if diamond could absorb bullet impact, tye cost and availability would prohibit its use for the above said purpose.
為什么鉆石不能用來做防彈背心。
因?yàn)楹艽啵堑?，鉆石雖然硬，但很脆。它會(huì)像玻璃一樣被撞得粉碎。
成本高和可用性低，我們不想使用那種既昂貴又得不到大量供應(yīng)的材料。即使鉆石可以吸收子彈的沖擊，但其成本和可用性將限制其使用。
A bulletproof vest has to absorb energy. Hard substances are brittle. They absorb little energy until they break. If you want to absorb energy you need something tough.
防彈背心需要吸收能量，硬物質(zhì)易碎。它們只吸收很少的能量，直到它們破碎。如果你想吸收能量，你需要一些堅(jiān)韌的材料。
In short, hardness is not a particularly desirable property in armour. Glass is one of the hardest ‘everyday’ substances, and it certainly wouldn’t be your first choice for making armour out of.
You want strength (tensile in particular) combined with ductility, so that the armour can absorb the energy of the impact. Diamonds are not especially strong, and are very brittle - so even if you could make a sheet of the stuff, it would be hopeless as armour.
簡而言之，硬度并不是盔甲特別需要的特性。玻璃是最硬的“日?！蔽镔|(zhì)之一，它當(dāng)然不會(huì)是你制作盔甲的首選。
你需要強(qiáng)度（特別是拉伸）與延展性相結(jié)合，這樣盔甲就可以吸收沖擊的能量。鉆石不是特別堅(jiān)固，而且非常易碎——所以即使你能制作一張鉆石的薄片，它也無法做成盔甲。
It is very difficult to make diamond. Imagine a large sheet of diamonds. Impossible for actual technologies. And if you are thinking about glueing several diamonds, you move the problem on glue, so the diamonds are useless.
制造鉆石是很困難的，想象一下制造一大片鉆石，在實(shí)際技術(shù)中是不可能實(shí)現(xiàn)的。如果你想把幾個(gè)鉆石粘在一起，你就把問題轉(zhuǎn)移到了膠水上，這樣鉆石就不起作用了。
原創(chuàng)翻譯：龍騰網(wǎng) http://www.top-shui.cn 轉(zhuǎn)載請注明出處
Bulletproof vests need a high tensile strength material that acts like a tiny stretching net. Diamond is a solid brittle carbon crystal. Kevlar is a synthetic weave that does have those properties.
As a common lead bullet hits a Kevlar vest, the bullet deforms and goes splat on the Kevlar weave. This spreads the bullet’s force out along the weave and keeps it from piercing the body.
防彈背心需要一種高抗拉強(qiáng)度的材料，這種材料的作用就像一個(gè)微小的伸縮網(wǎng)。
鉆石是一種固體脆碳晶體，凱夫拉纖維是一種具有這些特性的合成纖維。
當(dāng)一顆普通的鉛彈擊中凱夫拉纖維背心時(shí)，子彈變形并飛濺到凱夫拉纖維上。這樣子彈的力量就會(huì)沿著織物擴(kuò)散，從而避免穿透身體。
It’s hard but it’s also brittle. It’s not going to stand up to a big shock.
Take a diamond, stick it on an anvil and hit it with a sledgehammer. You’ll get diamond dust in the process. The best bulletproof vests are the ones that are strong but flexible.
鉆石很硬，但也很脆。它經(jīng)受不住大的沖擊。
拿一顆鉆石，把它釘在鐵砧上，用大錘砸它。在這個(gè)過程中你會(huì)得到鉆石粉。最好的防彈背心材料是那些既結(jié)實(shí)又柔韌的材料。
Diamond is the hardest material as the composition of the diamond is about 99.95 percent carbon. The other 0.05 percent can include one or more trace elements, which are atoms that are not part of the diamond's essential chemistry. Considering the point of making a bulletproof vest from the diamond, the economic factors are responsible because as compared to the polyethylene fibers diamond is highly expensive and the high production cost will not make it economically feasible.
鉆石是最堅(jiān)硬的材料，因?yàn)殂@石的成分大約有99.95%是碳。剩下的0.05%可能包括一種或多種微量元素，它們是不屬于鉆石基本化學(xué)成分的原子。考慮到用鉆石制作防彈背心的觀點(diǎn)，經(jīng)濟(jì)是主要的影響因素，因?yàn)榕c聚乙烯纖維相比，鉆石非常昂貴，生產(chǎn)成本高，在經(jīng)濟(jì)上是不可行的。
Hardness - ability of a material to resist plastic deformation OR a materials ability to resist indentation.
Toughness - ability of a material to absorb energy and plastically deform without fracturing.
As one can see, hardness is not the same as toughness and typically they are terms used interchangeably in everyday life. You want bulletproof material to be tough, not hard. Hence, diamond bulletproof vest would be a pretty terrible idea.
硬度-材料抵抗塑性變形或材料抵抗壓痕的能力。
韌性-材料吸收能量和塑性變形而不斷裂的能力。
正如我們所看到的，硬度和韌性是不一樣的，通常它們在日常生活中可以互換使用。你希望防彈材料是堅(jiān)韌的，而不是堅(jiān)硬的。因此，鉆石防彈背心將是一個(gè)非常糟糕的主意。
A diamond is not metal and not only would it be financially prohibitive to make a vest out of this material.
鉆石不是金屬，而且用這種材料做背心不僅會(huì)在經(jīng)濟(jì)上令人望而卻步。
Diamond is not a metal.
Diamond is a STONE, crystal.
鉆石不是金屬。
鉆石是一種石頭、結(jié)晶。
原創(chuàng)翻譯：龍騰網(wǎng) http://www.top-shui.cn 轉(zhuǎn)載請注明出處
Originally Answered: If diamond is the hardest metal, why don't we make bulletproof vests out of diamond?
Diamond is brittle like glass, and isn’t a metal. I really wish that people were more educated.
如果鉆石是最硬的金屬，我們?yōu)槭裁床挥勉@石做防彈背心呢？
鉆石像玻璃一樣易碎，而且不是金屬。我真的希望人們能接受更多的教育。