Spontainous Crack while Holding in Hand

Let's start with how old is your iPad? If it is within a year of purchase, it would still be under the limited hardware warranty. Apple would have to agree that this issue is due to a manufacturing defect for any type of reimbursement/repair/replacement. If it is over a year old, and you purchased an AppleCare+ plan with it, you may be able to get it repaired/replaced at a reduced cost.

Your next steps would be to check your support coverage, and if eligible, take the iPad back to your local Apple Store for resolution.

Ref: Check Your Service and Support Coverage - Apple Support

Did you go to an Apple Store or an Apple Authorized Service Provider ... or to some other third-party repair facility? If it was the Apple Store, I suggest that you elevate this issue to the store's manager for resolution.

The key to get your iPad repaired or replaced at no cost will be to prove that this damage was due to a manufacturing defect and not due to carelessness on your part. This is where working with the Apple technician will be important. You have to understand, these folks see a lot of damaged Apple equipment and are pretty good at telling if something is because Apple failed to provide a quality product. Apple also periodically has recall programs for certain devices. Whether or not your iPad is one of them, you can check at this link: Exchange and Repair Extension Programs - Apple Support