dryer not heating up, ?

Chances are good that what tripped the breaker was the bra underwire causing the heating element to break and/or short out.  The breaker prevented things from getting worse, but the element needs to be inspected for breaks, and probably replaced.

DO NOT replace the entire dryer just because this part has failed.  Even if it costs $200 for a new element (not bloody likely, JSYK), that's a heck of a lot cheaper than a new dryer.  It isn't difficult to do.  Read up on the repair procedure, read up on what parts are needed, and start turning wrenches.

A dryer is only slightly more complex than a toaster oven.  If it's a convection toaster oven, it's almost exactly as complex.  There's nothing in there you can't figure out.

Good luck with it.

[edit]

It's a good idea to start with testing the thermal safety. Just put your meter on its terminals, it should be zero resistance. Unplug it first, of course.  You sound like you've got more on the ball than many askers but the obvious safety warnings have to be repeated, just because.

You can test your heating elements in similar fashion, but be certain you've got your probes on the ends of a single element.

The heating element itself is the LEAST likely culprit. The parts that are designed to fail first to protect the heating element are FAR more likely.

sounds like the heater wire is damaged and now is an open circuit; check that out.  Also you may have a heater safety fuse that also blew; check that out.

You can either watch the video on YouTube on how to replace a dryer element or you can call a service person.

Heating element, or there is a one time fuse in the back possibly.