讨论了循环加载下材料的塑性应变能、储能和热能耗散,发现当量应变能密度(equivalent strain energy density,ESED)准则相比Neuber准则多考虑了塑性应变能密度,因此当量应变能密度准则局部应变场估计值会远低于Neuber准则的估计值.提出...讨论了循环加载下材料的塑性应变能、储能和热能耗散,发现当量应变能密度(equivalent strain energy density,ESED)准则相比Neuber准则多考虑了塑性应变能密度,因此当量应变能密度准则局部应变场估计值会远低于Neuber准则的估计值.提出改进的当量应变能密度方法,改进方法的估算值比Neuber准则更接近试验值,且寿命估计结果在工程上应用安全.改进的当量应变能密度准则的估计结果与疲劳失效试验结果符合较好.展开更多
应用Neuber准则分析弹塑性材料缺口件时局部应力应变估计过高,因此预测初始寿命常给出过于保守的结论.由于当量应变能密度(Equivalent strain energy density,ESED)准则在Neuber准则的塑性变形项上增加了系数,局部应力应变估计结果更为...应用Neuber准则分析弹塑性材料缺口件时局部应力应变估计过高,因此预测初始寿命常给出过于保守的结论.由于当量应变能密度(Equivalent strain energy density,ESED)准则在Neuber准则的塑性变形项上增加了系数,局部应力应变估计结果更为准确.基于能量方法讨论了循环加载下材料的塑性应变能密度,发现ESED准则相比Neuber准则多考虑了塑性应变能密度,这是ESED准则局部应变场估计值远低于Neuber准则的估计值的能量理论基础.疲劳试验的结果验证了以上结论.展开更多
Experimental investigation was conducted for the dynamic response of a real spherical explosive chamber that can simulate 200 m deepwater explosive loaded 10 g TNT equivalent.The vibration characteristics and dynamic ...Experimental investigation was conducted for the dynamic response of a real spherical explosive chamber that can simulate 200 m deepwater explosive loaded 10 g TNT equivalent.The vibration characteristics and dynamic strength of the chamber were analyzed by measuring the strain profiles of six characteristic points on the chamber.The research results revealed the rule of the dynamic response of the chamber on different explosive loads and static pressures.It provides references for the design and development of the chamber to simulate deepwater explosion.展开更多
文摘讨论了循环加载下材料的塑性应变能、储能和热能耗散,发现当量应变能密度(equivalent strain energy density,ESED)准则相比Neuber准则多考虑了塑性应变能密度,因此当量应变能密度准则局部应变场估计值会远低于Neuber准则的估计值.提出改进的当量应变能密度方法,改进方法的估算值比Neuber准则更接近试验值,且寿命估计结果在工程上应用安全.改进的当量应变能密度准则的估计结果与疲劳失效试验结果符合较好.
文摘应用Neuber准则分析弹塑性材料缺口件时局部应力应变估计过高,因此预测初始寿命常给出过于保守的结论.由于当量应变能密度(Equivalent strain energy density,ESED)准则在Neuber准则的塑性变形项上增加了系数,局部应力应变估计结果更为准确.基于能量方法讨论了循环加载下材料的塑性应变能密度,发现ESED准则相比Neuber准则多考虑了塑性应变能密度,这是ESED准则局部应变场估计值远低于Neuber准则的估计值的能量理论基础.疲劳试验的结果验证了以上结论.
基金National Natural Science Foundation of China （No. 51174147） Hubei Province Natural Sci- ence Foundation （No. 2012FFA13）
文摘Experimental investigation was conducted for the dynamic response of a real spherical explosive chamber that can simulate 200 m deepwater explosive loaded 10 g TNT equivalent.The vibration characteristics and dynamic strength of the chamber were analyzed by measuring the strain profiles of six characteristic points on the chamber.The research results revealed the rule of the dynamic response of the chamber on different explosive loads and static pressures.It provides references for the design and development of the chamber to simulate deepwater explosion.
