摘要
为对大瓣片高强钢球罐壳板成形过程进行应力测试与分析,在分析壳板成形工艺特点和力学特征的基础上,提出了在板材上附加随动测试架的测试方法,该测试架可随板材运动,实现对传感元件的保护,保证测试信号的输出,同时不干扰壳板的工艺条件,实现了准确测定冲压加工过程中特定状态下板壳内的应力分布及变化规律的目的。测试表明,压力加工过程中,当模具完全冲压到位时,在模具中心区域出现最大拉伸应变,应力值也最大,而卸载后该区反而出现了很小的压应力,这对容器的安全是有利的。因此在压制过程中只要控制冲压变形量,使得中间部位应力值小于材料的强度极限,就可保证板材不发生工艺性破裂,而且成形完成后该区也无不利的力学因素。
Stresses in the shell shaping of the large pieces of high strength steel spherical tank were tested and analyzed. Based on the analysis of sell forming technical characteristics and the mechanics characteristics, a new measurement method was proposed, that is a test frame was installed on the steel plate. The test frame can move with the steel plate, which can protect sensors and assure the output of signal, and the technical condition of shell is stable. It can accurately measure the stress distribution and change regulation in the shell under the specific condition during punching. It is shown that in the process of punching, when the model is punched to the right place, the maximum stretching strains and the stress appear in the central area of the model. While the punching is released, the stress in this area becomes very low. This change is beneficial to the safety of the shell. Therefore, in the process of punching, it only needs to control the deformation of punching in order that the stress in the central area is lower than the strength limit of the material, there will be no craft crack in the material and disadvantageous mechanic factor in the central area.
出处
《实验力学》
CSCD
北大核心
2005年第4期554-560,共7页
Journal of Experimental Mechanics
基金
国家自然科学基金资助项目(10272034)
博士学科点专项科研基金资助项目(20010217003)
黑龙江省自然科学基金资助项目(A01-06)
关键词
实验力学
应力
测试
分析
process of punching
stresses in shell shaping
test frame
high strength steel spherical tank
