Can someone please give me a bit of advise. I was dealing with impact toughness of materials today, which I haven't dealt with since uni days. I was involved in charpy testing. I understand the concept of finding the impact toughness from the test [ m x g x (h2 - h1) ]. But what I cant get my head around is, say my result is 100J, is this impact value related to thickness? e.g. the CSA of the standard test specimen is 10mm x 10mm so if the specimen was 20mm x 20mm then the impact toughness will be higher?