ENERGY ABSORPTION MEMBER

• Main Author: ISHIZUKA YUJI
• Format: Patent
• Language: English; Japanese
• Published: 05.01.2017
• Subjects: BLASTING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MEANS FOR DAMPING VIBRATION; MECHANICAL ENGINEERING; SHOCK-ABSORBERS; SPRINGS; THERMAL INSULATION IN GENERAL; WEAPONS

PROBLEM TO BE SOLVED: To provide an energy absorption member which can exert high energy absorption performance without depending on a temperature while being easy in manufacturing.SOLUTION: An energy absorption member is composed of a hollow body having a polygonal cross section which is formed of a thermoplastic fiber-reinforced resin whose material core stiffness Ec is within a range of 10 GPa to 35 GPa at a temperature of 100°C. Since the energy absorption member is collapsed at a collapsing mode at an input of an axial load, an energy absorption amount can be increased by collapsing the energy absorption member at the collapsing mode even in a high temperature at which the rigidity and stiffness of a material are lowered while enabling the injection molding of the energy absorption member at high quality. When shape stiffness t/b being a ratio of a plate thickness t with respect to a length b of each side of the cross section satisfies (t/b)Ec≥76, it is assured that the energy absorption member is collapsed at the collapsing mode at the input of the axial load, and the energy absorption amount can be increased.SELECTED DRAWING: Figure 1 【課題】 製造が容易でありながら、温度に依存せずに高いエネルギー吸収性能を発揮可能エネルギー吸収部材を提供する。【解決手段】 エネルギー吸収部材は、材料圧縮剛性Ｅｃが１００゜Ｃの温度下で１０ＧＰａ〜３５ＧＰａの範囲内にある熱可塑性繊維強化樹脂製の多角形状断面の中空体よりなり、軸方向荷重の入力時に粉砕モードで破壊するので、エネルギー吸収部材を高品質に射出成形することを可能にしながら、材料の強度や剛性が低下する高温下であってもエネルギー吸収部材を粉砕モードで圧壊してエネルギー吸収量を増加させることができる。断面の各辺の長さｂに対する板厚ｔの比である形状剛性ｔ／ｂが、（ｔ／ｂ）2・Ｅｃ≧７６を満たせば、軸方向荷重の入力時にエネルギー吸収部材が粉砕モードで圧壊することを保証してエネルギー吸収量を増加させることができる。【選択図】 図１