Page 18 - 2019 Brochure Chinese & Englsih Dora

防彈玻璃
Bulletproof Glass
單向防彈玻璃通常被製成二層:在外部的易碎的一層和在裡面的柔韌 的一層。當一個子彈從外部射入時，子彈會先擊中易碎的一層，並打 碎一個區域。這會吸收一些子彈的動能，並且在一個更大的區域傳播 動能。當減慢的子彈擊中柔韌的一層時，它就被擋住了。但是，當子 彈從裡面射出，它會先擊中柔韌的一層。子彈能把柔韌的一層擊穿是 因為它的能量集中於一個小範圍，脆的一層在柔韌的那層向外彈時向 外碎裂，而且不妨害子彈的前進。 防彈玻璃是在具有玻璃的透光、透像性能的同時，還對槍彈射擊具有 防護能力的玻璃。防彈玻璃的防彈原理是它能將子彈的衝擊動能轉化 為玻璃的彈性勢能和碎片的表面能。
Bulletproof
armor, and bullet-resistant glass) is a strong and optically transparent material that is particularly resistant to penetration by projectiles. Like any other material, it is not completely impenetrable. It is usually made from a combination of two or more types of glass, one hard and one soft. The softer layer makes the glass more elastic, so it can flex instead of shatter. Theindex of refraction for both of the glasses used in the bulletproof layers must be almost the same to keep the glass transparent and allow a clear, undistorted view through the glass. Bulletproof
glass varies in thickness from 3⁄4 to 3 1⁄2 inches (19 to 89 mm).
glass (ballistic
glass, transparent