交变应力,循环应力 cyclic stress 截面法 method of sections 截面几何性质 geometrical properties of an area 截面核心 core of section 静不定次,超静定次数 degree of a statically indeterminate problem 静不定问题,超静定问题 statically indeterminate problem 静定问题 statically determinate problem 静荷载 static load 静矩,一次矩 static moment 颈缩 necking K 开口薄壁杆 bar of thin-walled open cross section 抗拉强度 ultimate stress in tension 抗扭截面系数 section modulus in torsion 抗扭强度 ultimate stress in torsion 抗弯截面系数 section modulus in bending 拉压刚度 axial rigidity 拉压杆,轴向承载杆 axially loaded bar 理想弹塑性假设 elastic- perfectly plastic assumption 力法 force method 力学性能 mechanical properties 连续梁 continuous beam 连续条件 continuity condition 梁 beams 临界应力 critical stress 临界荷载 critical load 迈因纳定律 Miner's law 名义屈服强度 offset yielding stress 莫尔强度理论 Mohr theory of failure 敏感栅 sensitive grid 挠度 deflection 挠曲轴 deflection curve 挠曲轴方程 equation of deflection curve 挠曲轴近似微分方程 approximately differential equation of the deflection curve 内力 internal forces 扭力矩 twisting moment 扭矩 torsional moment3 交变应力，循环应力 cyclic stress 截面法 method of sections 截面几何性质 geometrical properties of an area 截面核心 core of section 静不定次，超静定次数 degree of a statically indeterminate problem 静不定问题，超静定问题 statically indeterminate problem 静定问题 statically determinate problem 静荷载 static load 静矩，一次矩 static moment 颈缩 necking K 开口薄壁杆 bar of thin-walled open cross section 抗拉强度 ultimate stress in tension 抗扭截面系数 section modulus in torsion 抗扭强度 ultimate stress in torsion 抗弯截面系数 section modulus in bending L 拉压刚度 axial rigidity 拉压杆，轴向承载杆 axially loaded bar 理想弹塑性假设 elastic-perfectly plastic assumption 力法 force method 力学性能 mechanical properties 连续梁 continuous beam 连续条件 continuity condition 梁 beams 临界应力 critical stress 临界荷载 critical load M 迈因纳定律 Miner’s law 名义屈服强度 offset yielding stress 莫尔强度理论 Mohr theory of failure 敏感栅 sensitive grid N 挠度 deflection 挠曲轴 deflection curve 挠曲轴方程 equation of deflection curve 挠曲轴近似微分方程 approximately differential equation of the deflection curve 内力 internal forces 扭力矩 twisting moment 扭矩 torsional moment