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在大多数固体推进剂特性的线性和非线性理论中,一个主要的缺陷在于忽略了内部损伤。对于那些已引出损伤参数的非线性理论,数值常数与推进剂的物理性质无关。而且,这些理论具有如此复杂的性质以至于要完成一个庞大的实验测试程序。已经提出了一个表示固体推进剂性质的简单方法。这个方法以一个基本定律为基础,该定律用一个应力衰减函数修正粘弹表达式。根据单轴试验数据,可用衰减函数表示推进剂的非线性性质。在卸载期损伤的表达式中,这个方法比过去的方法显示出重大的改进。分别定义松弛和再加载为过去最大应力的正态函数。利用这种方法对复杂的过程进行了预测,而且实测应力与预测应力很接近。
In the linear and non-linear theory of most solid propellant properties, one of the major drawbacks is the neglect of internal damage. For those nonlinear theories that have induced damage parameters, the numerical constants have nothing to do with the physical properties of the propellant. Moreover, these theories are so complex that they have to complete a large experimental test program. A simple method to characterize the solid propellant has been proposed. This method is based on a fundamental law that modifies viscoelastic expressions with a stress-decay function. According to the uniaxial test data, the attenuation function can be used to represent the non-linear nature of the propellant. In the expression of damage during unloading, this method shows a significant improvement over the previous methods. Define normal functions that relax and reload, respectively, as the maximum stress of the past. The complex process is predicted by this method, and the measured stress is close to the predicted stress.