In class, we discussed the crack track tip stress field in a 2-D solid subjected to uniaxial stress. We showed that the stress at the crack tip is "singular". What is implied by "singular stress"? Explain in your own words. I expect a very short (one or two sentences) answer. You don't need any equations or calculations but if it helps, you are welcome to make use of them. y crack r 0 0. xy XX crack X Crack tip stress