多孔腹板在谱载下的疲劳寿命分析

Multi-holed Plate Fatigue Life Analysis under Wing Loading Spectra

运用有限元方法对开多个孔的某型飞机机翼大梁肋间腹板进行了应力分析 ,在考虑孔间影响的基础上确定了多孔腹板的应力集中系数。并根据该型飞机重心载荷谱确定了机翼载荷谱 ,对低载下的σmax-N曲线和εeq-Nf 进行当量修正 ,然后用名义应力法和局部应力应变法分别计算了其疲劳寿命 。

This paper applies finite element approach to establishing multi-holed plate finite element mode and analyzing the stress of wing longeron web with several radius holes or openings. And then it determines the general stress concentration factor considering the difference of apertures and the spacing between holes. Furthermore, the paper translates the realistic centrobaric loading spectra into the spectra of wing spar web on the basis of test data and modifies curves of δmax-N and ε eq -N f under low wing loading spectra. And then, it applies Miner's rule and local stress-strain approach respectively to calculating fatigue life of the plate and analyzes the results of the two approaches.