Various strength theories of cement - soil including traditional strength theory and uniform strength theory of double shear were discussed in this paper 详细讨论了水泥土的各种强度理论,包括传统的强度理论和双剪统一强度理论。
Basing on compressive mechanism and main factors that impact compressive strength , the compressive strength formulas of block masonry are establish , using stress and strain method respectively ; basing on mechanism of shear and main factors that impact shear strength , the shearing strength formulas of block masonry are set up , introducing hoffman rule and the twin shear strength theory method respectively 依据受压工作机理和影响砌块砌体抗压强度的主要因素,分别用应力法和应变法建立了砌块砌体抗压强度公式;依据受剪工作机理和影响砌块砌体抗剪强度的主要因素,用hoffman准则和双剪强度理论分别提出了砌块砌体抗剪强度公式。
Firstly on the basis of twin shear unified strength theory and spherical cavity expand theory it is established the expression about target defense force , given the equations of rod projectile penetrate and impact velocities on ceramic / composite target under the same pressure and verified through the experiment . secondly the analysis model of ceramic / grfp / steel composite multi - layer target penetrate depth employing above differential equation of target defense force , penetrate velocity and rod velocity . there are two team of experiments which testify separately the penetrate depth and effect with different length - to - diameter 首先,基于双剪统一强度理论和球型空穴膨胀理论建立了靶板抗力表达式,并通过压力相等条件给出了杆式弹侵彻陶瓷复合靶板的侵彻速度与撞击速度的表达式,最后用试验进行了验证;其次,利用上面的靶板抗力表达式、侵彻速度、弹杆速度的微分方程,建立了陶瓷/玻璃钢/钢板复合多层靶板侵彻深度分析模型,分两组试验对侵彻深度、不同长径比的侵彻效果进行了验证;最后,建立了杆式弹垂直侵彻陶瓷多层复合靶板的工程模型,给出了预测靶板抗弹性的k 。