I changed share topology to none from shared, after doing that %90 of my bodies became sweepable. Idk why but sharing topology cuased the problem I guess. The software defined bonded contact for every part I splitted, since there is a lot of splitted part it is not possible to define contacts one by one for me. I checked penetration gap etc. from connection tool after solved the model, it seems there is no penetration(really really small number such as 7.e-9) and no gap between parts so it seemed okay to me but can I trust the software about making connections or do I have to use shared topology? Normally there is no assembly, it is one big solid casting part but it defined connections because I turned off share topology, as far as I know bonded contact will act same as shared topology for implicit static analysis, please correct me if I am wrong. Thanks