STRENGTH THEORIES 88-1 CONCEPTS OF STRENGTH THEORIES 1、 Opening words: 1) Investigation of the tensile, compressive and torsional tests of cast iron and low-carbon steel Compression of 0 Tension of cast iron cast iron Low carbon steel Cast iro P 2) How will the member rupture in Combined deformations? M1、Opening words： §8–１ CONCEPTS OF STRENGTH THEORIES 1)、Investigation of the tensile, compressive and torsional tests of cast iron and low-carbon steel M Low￾carbon steel Cast iron P P Tension of cast iron P Compression of cast iron 2)、How will the member rupture in Combined deformations？ M P 5