I am modeling friction stir welding using transient structural WB. I keep getting the following errors:
1. Some of the element based thermal loads may be inappropriate. Check applied element loads carefully. Ensure those film coefficients and bulk temperatures are always positive.
2. Element 232 (type = 5, SOLID226) (and maybe other elements) has become highly distorted. Excessive distortion of elements is usually a symptom indicating the need for corrective action elsewhere. Try ramping the load up instead of step applying the load (KBC,1). You may need to improve your mesh to obtain elements with better aspect ratios. Also consider the behavior of materials, contact pairs, and/or constraint equations. Please rule out other root causes of this failure before attempting rezoning or nonlinear adaptive solutions. If this message appears in the first iteration of first substep, be sure to run shape checking of elements.
BTW: I followed most recommendations that are available on student-community, unfortunately, didn't solve those issues. Any hints or suggestions are available to me. Thank you in advanced,