n ngnrng nd mtrls scnc, strss–strn crv fr mtrl gvs th rltnshp btwn strss nd strn. t s btnd by grdlly pplyng ld t tst cpn nd msrng th dfrmtn, frm whch th strss nd strn cn b dtrmnd (s tnsl tstng). Ths crvs rvl mny f th prprts f mtrl, sch s th Yng's mdls, th yld strngth nd th ltmt tnsl strngth.