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An anti-intrusion bar or beam is a passive safety device, installed in most cars and other ground vehicles, which must protect passengers from side impacts.〔http://www.autosafetyexpert.com/Assets/Docs/on_the_safe_side.pdf〕 Side impacts are particularly dangerous for two reasons: a) the location of impact is very close to the passenger, who can be immediately reached by the impacting vehicle; b) in many side-impact accidents, the impacting vehicle may be larger, taller, heavier, or structurally stiffer than the struck vehicle. The role of an anti-intrusion bar is to absorb the kinetic energy of the colliding vehicles that is partially converted into internal work of the members involved in the crash. ==Performance== The performance of a side beam is measured by several indicators. The most important are: * the Specific Energy Absorption (SEA), which measures the amount of energy absorbed per unit mass; * and the energy efficiency η, which is the ratio between the mean load and the peak load transmitted to the vehicle during the impact. Furthermore: * the amount of intrusion, for a given energy, must be as small as possible; * the maximum depth or diameter of the bar must be reasonably small, as the vehicle door does not generally allow much space; * the cost of the member must be possibly small. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Anti-intrusion bar」の詳細全文を読む スポンサード リンク
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