軍用頭盔可否防彈?

美軍上一個世代的合成纖維戰鬥頭盔PASGT,其宣稱的防護能力是能抵禦1.1克重的物體以秒速620米垂直的,近距離的撞擊,將這些數字化為動能,即為211焦耳~
(以上防禦能力無視物件形狀和大小)

而俄羅斯特種部隊採用的STSH81多層鈦合金頭盔之防護能力則為能抵擋5.45亳米高穿透力手鎗彈,9亳米馬卡洛夫手鎗彈與同級的,鎗口動能為350焦耳的子彈~

從以上資料我們可以看出,
戰鬥頭盔僅能抵擋標準規格的手鎗子彈的近距離直射,
對於鎗口動能動輒以一千焦耳以上的標準突擊步鎗彈直射肯定是穿定的,
除非步鎗彈是從遠距離射來,動能嚴重衰弱,或者子彈入射角很小,使動能無法聚焦於頭盔防護面而被跳開..等等,等等,才有吃得下步鎗彈而不穿的機會...

那麼軍人為什麼要戴一個說是防彈卻防不了彈的鐵鍋?

其實比起子彈,在戰場上更易造成步兵傷亡的是林林總總的障礙物,被爆風掀起的瓦礫雜物,隊友們亂揮的肢體等等的東西...

總言而之,就是一些速度相對子彈慢很多,穿透力較子彈低很多,但卻比子彈更有效率,更廣泛地傳遞動能,容易導致大面積的皮下傷害的東西~

在這些時候,頂著一頂頭盔與否就是生死關鍵了~

戴著頭盔,這些衝力就能被盔身均勻地吸收,並傳遞至頭盔的緩衝網層,
從而令衝力分散,減緩至一個頭部組織可以承受,或傷不致腦震盪,頭骨碎裂與肌肉嚴重扭傷的地步...但若沒有戴,這些衝力就必須由血肉之軀完全承受...

而家D頭盔大概可以防到9mm手槍彈同155mm炮彈
破片家~

睇過其他知識仲話防唔度彈
係真唔係呢?

Basically, Helmet IS NOT USED TO STOP BULLET......
Helmet works because it's shapes, it Deflect bullet, simple because bullet usually follow gravity trijectory, bullet will not go straight, when the bullet hit a helmet at certain angle, the bullet will be deflected once it hits the helmet.

If you look closer, most accurate war movie depict a bullet hit a helmet and left a stratching mark on it, it is because it deflect the bullet and scratch the surface.

Bascially, the material they used to make US MICH cannot even stop a 9mm round when it enter at 2 degree

唔保護下一中就玩完既頭?

2 reasons

1.) Head is EXTREMELY HARD TO HIT. Especially in a distant. The chances of getting hit in the head is relatively smaller than the chance you get hit in the chest. In the basic training, you were taught to hit the center of a body mass (Which is your stomach-chest area) to bring down a target, sometime, believe it or not, hitting people in the head will not stop them nor will bring them to ground, cos the bullet will just slice thru their head and exit, hitting a few nerve and deal minimal damage.

2.) IT is extremely hard to protect your head, as you need to maintain movement and sight, which mean a lot of area must leave unprotected or it will impeached yourfighting ability.

定係其實可以防度彈係我估錯??
係咁既話邊頭盔防度咩頭盔距離既彈?


As i said before, Mhelmet is used to deflect bullet, not to stop a bullet...

吾可以,吾夠硬.......................

不同的槍械和不同的子彈都有不同的殺傷力和穿透力

防彈衣也是~不同的材料~有多少重~

可以防彈的頭盔我都見過


但暫時沒有能完全防禦到 重型機關機和追擊槍


明珠台/國際台 我忘了

早前曾播放過有關節目

Combat Helmet, like bulletproof vest has different level of protection.

The more steel you use on the helmet, the better protection against a "straight-on" bullet, thus, the HEAVIER the helmet is, and it is not practical. (that's why you see in movie, they "duck" when there is incoming fire)

Any NATO bullet shooting at those helmet other than "straight-on" will be ricocheted. And THAT'S the purpose of it.

When you talk about bulletproof, I will ask "how big of a bullet you want to stop?"

5.56 & 7.62 r common NATO infantry rounds. And those infantries are only wearing a "flak jacket" with ceramic inserts on front & back approximately 30cmX30cm in size. Keep in mind that they are also carrying food, water, extra ammo, first-aid kid, shovel, NV, radio, etc.

So again, how much more weight you them to carry?
It's better to shoot than being shot at, so, ATTACK.

At last, how much do you want to spend on EACH piece of equipment is also need to consider.

對於一些手槍/步槍就可以防到D子彈,但對於重形機槍/狙擊步槍的話是防唔到的
因為這些槍可以穿過頭盔/避彈衣,雖然可以穿過但是頭盔/避彈衣已經把子彈的衝擊力削弱了

2010-06-17 13:34:46 補充：
有些頭盔是作保護色之用,用來埋伏之用,使他們可以靈活和輕便執行任務
而頭部比較細,難以命中
如果頭中了槍,唔死都會癱瘓
身體大,易命中,他們選擇保護內臟是因為,身體一但用了重傷,就會出血過多意識蒙糊,嚴重出血過多會死的,和重傷之下身體動作變得遲鈍,容易被人射中