【摘 要】
：
球状材料表面温度突然升高后，随着温度的传入，球心处预存微孔发生变化。在球坐标系下建立组合球模型，考虑其球对称准静态过程，通过几何尺寸比例的变化模拟温度传入的过程。认为外部壳体是受均匀温度影响下的小变形热弹性材料，内部球体是球心处预先存在微孔的大变形弹塑性材料，塑性体积不可压缩。给出了微孔在不同温度和不同比例几何尺寸下的变化情况，分析了球体内部的应力分布情况。结果表明，随着温度传入使球内有塑性区域产
【机 构】
：
北京科技大学国家材料服役安全科学中心,北京 100083 北京科技大学国家材料服役安全科学中心,北
【出 处】
：
爆炸科学与技术国家重点实验室2011年学术年会暨International Workshop on Intensive
论文部分内容阅读
球状材料表面温度突然升高后，随着温度的传入，球心处预存微孔发生变化。在球坐标系下建立组合球模型，考虑其球对称准静态过程，通过几何尺寸比例的变化模拟温度传入的过程。认为外部壳体是受均匀温度影响下的小变形热弹性材料，内部球体是球心处预先存在微孔的大变形弹塑性材料，塑性体积不可压缩。给出了微孔在不同温度和不同比例几何尺寸下的变化情况，分析了球体内部的应力分布情况。结果表明，随着温度传入使球内有塑性区域产生后，微孔的增长对温度较为敏感。微孔的附近会形成一个很薄的类似边界层的薄层，应力在其中有非常剧烈的变化。产生塑性区域后，该区域移动到塑性区边缘附近。当微孔极小时，其几何尺寸对其变形的影响极小。
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