 photo-thermoelast investig transient thermal stress multiweb wing structur photo-thermoelast investig transient thermal stress multiweb wing structur photothermoelast experi perform long multiweb wing model theoret analysi literatur experiment procedur util simul condit prescrib theori fulli describ correl theori experi term dimensionless temperatur stress time biot number reveal theori predict valu higher experiment observ maximum thermal stress center web detail temperatur measur flang suggest major sourc discrep trace on-dimension heat conduct analysi flang emploi theori 