NEPE推进剂在围压下压缩行为的实验研究和建模,Propellants, Explosives, Pyrotechnics

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NEPE推进剂在围压下压缩行为的实验研究和建模
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2021-03-22 , DOI: 10.1002/prep.202000326
Hui Li ₁ , Jin‐sheng Xu ₁ , Xiong Chen ₁ , Yu‐fei Hou ₁ , Xing‐gui Fan ₁ , Meng Li ₂ , Hong‐wen Li ₃

Affiliation

为研究围压和应变速率对硝酸酯增塑聚醚（NEPE）推进剂力学性能的影响，采用新型活性气体围压试验机在各种围压条件和应变速率下进行了压缩试验. 获得了NEPE推进剂在不同围压条件和应变速率下的应力-应变曲线和力学性能。结果表明，NEPE推进剂的压缩力学性能受围压和应变速率的影响显着。围压下的抗压强度明显大于未施加围压的抗压强度。在围压和应变率的耦合作用下，5.4 MPa和6.67×10^-2 s ^-1是其在室温条件下的值的2.17倍和6.67×10 ^-4 s ^-1。然后，基于先前的拉伸结果，提出了不同实验条件下拉伸和压缩力学性能的量化比较。最后，构建了一个带有损伤的非线性本构模型来模拟压力的影响。统计损伤模型参数定义为压力P 的ExpDec1 函数。校准后的模型可以准确预测NEPE推进剂在不同围压条件和应变率下的力学行为。

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Experimental Investigation and Modeling the Compressive Behavior of NEPE Propellant under Confining Pressure

In order to study the effects of confining pressure and strain rate on the mechanical properties of the Nitrate Ester Plasticized Polyether (NEPE) propellant, compressive tests were conducted under various confining pressure conditions and strain rates using a new-designed active gas confining pressure testing machine. The stress-strain curves and mechanical properties of the NEPE propellant under varying confining pressure conditions and strain rates were obtained. The results show that the compressive mechanical properties of the NEPE propellant are remarkably influenced by the confining pressure and strain rate. The compressive strength under confining pressure is obviously larger than those without applied confining pressure. With the coupled effects of the confining pressure and strain rate, the compressive strength under 5.4 MPa and 6.67×10⁻² s⁻¹ is 2.17 times of its value at room condition and 6.67×10⁻⁴ s⁻¹. Then, based on previous tensile results, the quantified comparisons of tensile and compressive mechanical properties under different experimental conditions were presented. Finally, a nonlinear constitutive model with damage was constructed to model the effect of pressure. The statistical damage model parameters were defined as ExpDec1 function of pressure P. The calibrated model can accurately predict the mechanical behaviour of the NEPE propellant under different confining pressure conditions and strain rates.

更新日期：2021-03-22

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