Gap Elements KIT（差距元素包）.pdfVIP

LESSON 5 Gap Elements P (1) (2) (3) (4) (5) P Objectives: Use of GAP contact elements Small deformation theory Varying contact condition PATRAN 322 Exercise Workbook 5-1 5-2 PATRAN 322 Exercise Workbook LESSON 5 Gap Elements Model Description: Three parallel cantilever beams are initially separated, but have possible contact points in five locations, as shown in the figure on the following page. A pair of pinching loads is applied, as shown. The pinching loads are increased from no load at the beginning of the step, to full load, 200 lbs, at the end of the step. Only small displacements are considered, so that each beam responds in pure bending. The problem is entirely linear, except for the switching contact conditions. The sequence of events is readily imagined: 1. The top and bottom beams bend as the pinching forces are applied, and the first contact occurs when the tip of the top beam hits the tip of the middle beam (gap 3 closes). Up to this point the problem is symmetric about the middle beam, but it now loses that symmetry. 2. Subsequent to this initial contact, the top and middle beams bend down