{"id":381792,"date":"2024-09-07T07:50:33","date_gmt":"2024-09-07T07:50:33","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/stress-too-high-in-transient-simulation\/"},"modified":"2024-09-08T06:59:01","modified_gmt":"2024-09-08T06:59:01","slug":"stress-too-high-in-transient-simulation","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/stress-too-high-in-transient-simulation\/","title":{"rendered":"Stress too high in transient simulation."},"content":{"rendered":"

<p><p>I would like to perform a transient simulation of carbon fiber components. The two sandwich plates with attached stiffening Rips are connected using bonded MPC contacts.<\/p><p>The boundary conditions are as follows: on the front side, a remote displacement is fully constrained in all directions and on the rear side, it is constrained in such a way that expansion in the length direction is still possible.The plates rest on 8 points on the ground. <br>These points are constrained in the Z direction using remote boundary conditions. (Also tried with fixed fixed configuration same result.)<\/p><p>I applied measured accelerations to each of the 8 boundary conditions on the ground (6000 steps measured at 10 000 Hz -> as I understand, this results in a time step of 1\/10 000 (Mesurement Time was 0.6 seconds)).<br>The mesh used has already been applied in static simulations and has converged in those cases.I am outputting the equivalent stresses and obtaining a maximum of approximately 6000 MPa, which I consider unrealistic. <br>The maximum stresses occur in the area of the support points on the ground. <br><br>My main idea is to perform a static analysis that includes gravitational acceleration, followed by a indeoendent transient simulation. <br>I would then sum the maximum stresses from both analyses (at a critical Element of the geometry). If the sum of these stresses is below the fatigue limit (~450 MPa), can I assume that the structure is durable and will not experience fatigue failure? Is this approach valid for a preliminary  assesment, or are there other factors I should consider?<\/p><p><\/p><p>Can anyone provide me with tips on how to proceed, or possible Problems?<\/p><\/p><p><\/p><p><\/p><\/p>\n","protected":false},"template":"","class_list":["post-381792","topic","type-topic","status-publish","hentry","topic-tag-transient-structural"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t