Hello, Iam trying to find a material which will fail after a week or so under roughly 2.5 giga pascals. The load will vary slightly but not overly significantly considering the magnitute of pressure. It stays between about 1 to 3 degrees celcius and stays in a non-oxidising environment. The shape of the structure is spherical. Any suggestions of material would be fantastic but thats not what iam here to ask: Basically under the above set conditions, iam looking for some way to predict when a certain material will fail. I know this will depend on the material, how its formed, etc but those are deliberate variables which I intend to change - Iam wondering if someone could direct me to some way of being able to make an informed decision on how I could go about selecting these variables with an approximate time frame in mind of when the structure will fail. I'd appreciate any ideas/input, thank-you!