长管拖车天然气瓶疲劳寿命分析

Analysis of fatigue life for tube trailer cylinders

长管拖车天然气瓶在内压变化及道路运输造成的惯性载荷作用下,存在疲劳失效风险。为了明确在交变载荷作用下气瓶的安全状态,以目前广泛采用的长管拖车天然气瓶为模型,针对内压和惯性载荷作用下的长管拖车气瓶进行了疲劳分析。采用ANSYS Workbench进行模拟,得到了不同载荷条件下气瓶的疲劳寿命分布情况。分析结果表明,在内压作用下,气瓶处于有限疲劳寿命状态,但能够满足要求;当惯性载荷超过一定数值时,长管拖车气瓶处于有限寿命状态,不满足强度要求,因此要控制其受到的惯性载荷。

Risk of fatigue failure exists in the tube trailer cylinders under the condition of internal pressure variation and inertial load caused through road transport.In order to estimate the safety state of the cylinders under the action of alternating load,the model of certain geometry sizes is built based on the widely used tube trailer cylinders.The fatigue analysis of tube trailer gas cylinders is made aiming at the action of the internal pressure and the inertial load.The fatigue life distribution of cylinders is obtained under the condition of different loads through the numerical simulation by ANSYS Workbench.The analysis results show that under internal pressure,gas cylinders have limited fatigue life,but can satisfy the requirements;when the inertial load exceeds a certain value,natural gas cylinders of tube trailer is under finite life state,which does not meet the requirements of strength,therefore the inertial load should be controlled.