| 【文章摘要】 Thermal stress of SEN was studied by using finit element analysis( FEA). The results disclose:( 1) fo the tapered zone of SEN,the thermal stress reaches it peak after casting for about 30 s,at this moment,th axial stress is the largest,the circumferential stress come the second and the radial stress is the smallest;( 2)when SEN suffers the thermal stress,the inner wall suf fers the pressure stress,and the shorter the distance from the inner wall is,the larger the pressure stress is; th outer wall suffers the tensile stress and the shorter the dis tance from the outer wall is,the larger the tensile stres is; the axial stress holds a dominant position in the ta pered zone,while the circumferential stress takes the lead in the cylindrical zone;( 3) as angle α of SEN's taper ed zone increases, the thermal stress grows obviousl when α is larger than 110°; while the thermal stress re duces obviously,when α is larger than 140°; thus,fo SEN design,it is essential to avoid the interval of α =110°- 140°. |