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The torsional impact response of a penny-shaped crack in a nonhomogeneous strip is considered. The shear modulus is assumed to be functionally graded such that the mathematics is tractable. Laplace and Hankel transforms were used to reduce the problem to solving a Fredholm integral equation. The crack tip stress field is obtained by considering the asymptotic behavior of Bessel function. Explicit expressions of both the dynamic stress intensity factor and the energy density factor were derived. And it is shown that, as crack driving force, they are equivalent for the present crack problem. Investigated are the effects of material nonhomogeneity and strip‘s highness on the dynamic fracture behavior.Numerical results reveal that the peak of the dynamic stress intensity factor can be suppressed by increasing the nonhomogeneity parameter of the shear modulus, and that the dynamic behavior varies little with the adjusting of the strip‘ s highness. 相似文献
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功能梯度条硬币型裂纹扭转冲击响应 总被引:1,自引:0,他引:1
研究非均匀条中硬币型裂纹的扭转冲击问题.材料的剪切模量假定按特定的梯度变化.采用Laplace 和Hankel 变换将问题化为求解Fredholm积分方程,通过将Bessel函数渐进展开获得裂纹尖端动态应力场.考查非均匀参数和功能梯度条高度对裂尖动态断裂行为的影响.动应力强度因子和能量密度因子的清晰表达式表明,作为裂纹扩展力,对于这里所研究的问题,二者是等价的.动应力强度因子的数值结果显示,增加剪切模量的非均匀参数可以抑制动应力强度因子的幅度,而条形域的高度对动态断裂特性的影响较小. 相似文献
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辽宁省铁岭市作为传统以发展农业为主的城市,正经历着从农业城市向工业城市的重要转变。为了满足经济社会发展的需要,顺应无线电技术发展新趋势,适应无线电频率需求新变化,落实国家无线电台站属地化管理新要求,铁岭市无线电管理机构按照辽宁省无线电管理“十二五”规划方案,加大无线电管理技术设施建设力度,不断完善频谱监测、干扰查处和设备检测技术手段,提高监测规范化能力。 相似文献
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