燃气涡轮试验与研究
燃氣渦輪試驗與研究
연기와륜시험여연구
GAS TURBINE EXPERIMENT AND RESEARCH
2014年
1期
23-27
,共5页
GH536%局部应力集中%带孔平板试样%蠕变响应%火焰筒%数值模拟
GH536%跼部應力集中%帶孔平闆試樣%蠕變響應%火燄筒%數值模擬
GH536%국부응력집중%대공평판시양%연변향응%화염통%수치모의
GH536%local stress concentration%plate specimen with a hole%creep response%liner%numerical simulation
采用有限元方法对GH536带孔平板试样的蠕变响应进行了数值模拟，以圆孔半径为尺寸参数，研究了不同圆孔半径试样的蠕变应力、蠕变应变分布及其随时间的变化。计算结果表明：圆孔半径对应力分布影响显著，圆孔半径越小，最大等效应力越大，最大等效应力随时间的松弛越明显，蠕变引起的应力重新分布越明显；对含局部应力集中部位结构进行持久强度储备和寿命分析时，必须考虑局部应力分布特性的影响。
採用有限元方法對GH536帶孔平闆試樣的蠕變響應進行瞭數值模擬，以圓孔半徑為呎吋參數，研究瞭不同圓孔半徑試樣的蠕變應力、蠕變應變分佈及其隨時間的變化。計算結果錶明：圓孔半徑對應力分佈影響顯著，圓孔半徑越小，最大等效應力越大，最大等效應力隨時間的鬆弛越明顯，蠕變引起的應力重新分佈越明顯；對含跼部應力集中部位結構進行持久彊度儲備和壽命分析時，必鬚攷慮跼部應力分佈特性的影響。
채용유한원방법대GH536대공평판시양적연변향응진행료수치모의，이원공반경위척촌삼수，연구료불동원공반경시양적연변응력、연변응변분포급기수시간적변화。계산결과표명：원공반경대응력분포영향현저，원공반경월소，최대등효응력월대，최대등효응력수시간적송이월명현，연변인기적응력중신분포월명현；대함국부응력집중부위결구진행지구강도저비화수명분석시，필수고필국부응력분포특성적영향。
By adopting Norton model during FEM analysis, the creep response of plate specimens with vari-ous hole radius was simulated. Consequently, the stress and strain distribution and their histories were in-vestigated. The results show that radius of the hole holds strong influence on stress distribution. While radi-us of the hole is decreasing, the maximum equivalent stress is increasing, the creep relaxation is more obvi-ous, the stress distribution changes are more notable;local stress distribution and histories should be taken into account when the durability margin of safety and life of components with local stress concentration parts are assessed.
