【作者】 范钦满；

【Author】 FAN Qin-man (Department of Transportation Engineering,Huai Yin institute of technology,Huaian 223001)

【机构】 淮阴工学院交通工程系；

【摘要】 以承受低频高温热冲击和压力载荷的某失效薄壁容器为研究对象,使用直接耦合模型,采用温度相关的材料模型,应用有限元法,计算了容器的瞬态温度场和应力场响应,并分析了温度载荷对其失效的影响。研究表明：容器截面节点温度响应具有明显的热冲击特征。热冲击产生较高的内壁温度和较大的瞬时温度梯度；热冲击导致的瞬时峰值热应力明显高于内压产生的应力,周期性的耦合应力是导致容器开口孔处产生裂纹的主要因素。更多还原

【Abstract】 In allusion to a thin-walled vessel of failure receiving low-frequency thermal shock and pressure load, direct coupling model,temperature-related material model and Finite Element Method were applied to calculate the response of transient temperature field and transient stress field,based on which the influence of temperature load on failure of the vessel was analyzed.It shows that the node temperature response of the vessel cross-section has obvious thermal-shock characteristics that high temperature of inner wall and large gradient of transient temperature appear; transient peak thermal stress caused by thermal shock is obviously higher than caused by internal pressure,and the periodic coupled stress plays an important role in the formation of cracks distributing around the placket of the vessel.更多还原