Hello Mousetrap, thank you for your helpful reply! I'll see if i can add some more detail here. The material is a polycarbonate blend. It appears that the cracks are random; not propogating from the corner of the D or any place in particular. The D-ring is a small off-the-shelf ring that fits...
Hi,
I have a molded plastic knob whose application is on the end of an encoder. I see about 10% come back from the field with the hollow shaft (it's a D-shaft with a D-ring) having a crack in it. How do I determine if the knob shaft has a thick enough wall to contain the hoop stress?
Thanks!
