带筋整体壁板拉弯预应力喷丸成形技术及其应用

Integrally-stiffened Panel Stretch-bending Stress Peen Forming Technology and Its Application

基于增大筋条长度方向蒙皮外表面拉应力,提出一种弹性拉弯预应力喷丸成形的新方法,用以解决大曲率双凸外形带筋整体壁板所需喷丸变形量超过传统喷丸成形工艺极限问题。首先阐述拉弯预应力原理、分类及特点,阐明拉弯预应力喷丸成形方法;其次研究拉弯预应力新技术和拉弯预应力喷丸成形新工艺,采用反弯曲应力场法有限元方法,进行拉弯预应力喷丸成形数值模拟分析,并与拉伸预应力喷丸成形和弯曲预应力喷丸成形的数值模拟结果对比分析;最后开展拉弯预应力喷丸成形试验研究与验证,建立拉弯预应力喷丸变形与其工艺参数之间的数学模型,为拉弯预应力喷丸成形分析与应用提供了一种重要手段和途径。研究结果表明,拉弯预应力喷丸成形技术可以提高大曲率双凸外形带筋整体壁板筋条长度方向预应力、提高筋条长度方向预应力喷丸变形量、能够实现和满足其长寿命喷丸成形。

Aiming at the problem that the amount of shot peening deformation required for the large-curvature biconvex shape and high stiffened integral panel exceeded the limit of the traditional shot peen forming process,a new method of stretch-bending stress peen forming is proposed based on increasing the tensile stress of the outer surface of the skin in the length direction of the ribs.Firstly,the principle,classification and characteristics of stretch-bending prestressing are expounded,and the method of stretch-bending stress peen forming is explained.Secondly,the new technology of stretch-bending prestressing and the new technology of stretch-bending stress peen forming are studied.Using the finite element method of reverse bending stress field method,the numerical simulation analysis of stretch-bending stress peen forming is carried out,and the numerical simulation results of tensile stress peen forming and bending stress peen forming are compared and analyzed.Finally,the experimental research and verification of stretch-bending stress peen forming is carried out,and the mathematical model between the stretch-bending stress peen forming deformation and its process parameters is established,which is provided an important means and approach for the analysis and application of stretch-bending stress peen forming.The research results shows that for the large-curvature biconvex shape and high stiffened integral panel,the stretch-bending stress peen forming could improve the prestress in the length direction of the ribs,and increase the stress peen forming deformation in the length direction of the ribs,which can realize and satisfy its long-life shot peen forming.