【摘要】 以某型螺压改性双基(MDB)固体推进剂为试验样品，采用试验标定法对该型装药在单向拉/压应力场下的应变释放系数A和B进行标定。针对其弹性模量较小且线膨胀系数较大导致的应变背景数据波动变化的特性提出了一种判定方法。该方法有效降低标定过程中的系统误差，提高了系数A和B标定的准确性。经过标定，该型推进剂在拉应力下的应变释放系数A为-127.299 0,B为-1 565.817 1,在压应力下的应变释放系数A为-108.554 7,B为-1 163.525 0。此外，通过盲孔法测试研究了不同自然时效处理的推进剂装药的残余应力，分析了表面残余应力的演化过程。结果表明：该型装药表面残余应力为-0.6～0.6 MPa。随着自然时效时长的增加出现拉/压残余应力的交替变化，40 d以后表面出现较大的拉应力。更多还原

【Abstract】 Using a screw extruded modified double-base(MDB)solid propellant as an experimental sample, the strain release coefficients A and B under uniaxial tensile/compressive stress fields were calibrated via an experimental calibration method. A determination method was proposed to address the fluctuating strain background data caused by the propellant’s low elastic modulus and high liner expansion coefficient. This method effectively reduced systematic errors during calibration and improved the accuracy of coefficients A and B. The calibrated strain release coefficients A and B were-127.299 0 and-1 565.817 1 respectively under tensile stress, while those under compressive stress were-108.554 7 and-1 163.525 0 respectively. Additionally, residual stresses in propellant charges subjected to different natural aging treatments were investigated using the blind hole method, and the evolution of surface residual stresses was analyzed. The results revealed that the surface residual stresses of the propellant were-0.6-0.6 MPa. Alternating tensile/compressive residual stresses were observed with prolonged natural aging duration, and significant tensile stresses emerged on the surface after 40 days.更多还原