起重运输机械
起重運輸機械
기중운수궤계
HOISTING AND CONVEYING MACHINERY
2015年
5期
59-62,63
,共5页
通用桥式起重机%端梁变截面%名义应力法%热点应力法%等效结构应力法%疲劳寿命
通用橋式起重機%耑樑變截麵%名義應力法%熱點應力法%等效結構應力法%疲勞壽命
통용교식기중궤%단량변절면%명의응역법%열점응역법%등효결구응역법%피로수명
general-purpose overhead crane%end beam variable cross-section%nominal stress%hot stress method%e-quivalent stress method%fatigue life
桥式起重机端梁变截面处是应力集中区域，容易发生疲劳破坏，为了准确评估其疲劳寿命，拟采用名义应力法、热点应力法和等效结构应力法进行对比分析。利用HyperMesh有限元软件对起重机端梁变截面处建立包含焊缝细节的有限元计算模型，加载求解得到3种方法的表征应力曲线，根据焊接接头选取合适的S－N曲线进行疲劳寿命计算，对寿命大小和裂纹可能出现的位置进行对比分析。结果表明：等效结构应力法计算的疲劳寿命比较理想，裂纹出现的位置与实际中容易出现裂纹的位置基本吻合。因此，针对端梁变截面处的疲劳寿命估算可以采用等效结构应力法。
橋式起重機耑樑變截麵處是應力集中區域，容易髮生疲勞破壞，為瞭準確評估其疲勞壽命，擬採用名義應力法、熱點應力法和等效結構應力法進行對比分析。利用HyperMesh有限元軟件對起重機耑樑變截麵處建立包含銲縫細節的有限元計算模型，加載求解得到3種方法的錶徵應力麯線，根據銲接接頭選取閤適的S－N麯線進行疲勞壽命計算，對壽命大小和裂紋可能齣現的位置進行對比分析。結果錶明：等效結構應力法計算的疲勞壽命比較理想，裂紋齣現的位置與實際中容易齣現裂紋的位置基本吻閤。因此，針對耑樑變截麵處的疲勞壽命估算可以採用等效結構應力法。
교식기중궤단량변절면처시응력집중구역，용역발생피로파배，위료준학평고기피로수명，의채용명의응역법、열점응역법화등효결구응역법진행대비분석。이용HyperMesh유한원연건대기중궤단량변절면처건립포함한봉세절적유한원계산모형，가재구해득도3충방법적표정응력곡선，근거한접접두선취합괄적S－N곡선진행피로수명계산，대수명대소화렬문가능출현적위치진행대비분석。결과표명：등효결구응역법계산적피로수명비교이상，렬문출현적위치여실제중용역출현렬문적위치기본문합。인차，침대단량변절면처적피로수명고산가이채용등효결구응역법。
The end beam variable cross-section of the overhead crane is the stress centralized area,prone to fatigue damage.To accurately evaluate the fatigue life,it’s proposed to use the nominal stress method,hot-spot stress method,and equivalent structural stress method for comparison and analysis.HyperMesh finite element software is used to develop the fi-nite element calculation model for the beam variable cross-section containing weld joints,in order to get the representative stress curves of mentioned three methods by loading and solving.The figure life calculation is performed by selecting the proper S-N curve according to the weld joint,with comparison analysis for fatigue life and possible cracking positions.The result shows that the fatigue life calculated by equivalent structural stress method is ideal,with the cracking position exist-ing basically consistent with that easy to occur in actual condition.Therefore,the equivalent structural stress method may be adopted for fatigue life estimation of end beam variable cross-section.
