Fracture mechanisms in maraging steel-iron laminates

✍ Scribed by T.M. Devine; S. Floreen; H.W. Hayden

• Publisher: Elsevier Science
• Year: 1974
• Tongue: English
• Weight: 651 KB
• Volume: 6
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(74)90030-7

✦ Synopsis

Fracture in notched beams of maraging steel-Armco iron laminated composites loaded in threepoint bending took place in three stages. Stage I occurred at a critical plastic zone size and consisted of a critch propagating from the root of the notch and extending to a certain depth within the first layer of maraging steel. Stage II was a delamination by intergranular cracking within the middle layer of iron ahead of the sta.~ i cwch. Calculations indicate that Stage I I occurred when the transverse stress ahead of the Stage I crack reached a critical level equal to the intergranular fracture stress of iron. Stage III of the fracture se-q~nce con\i~~ed of a shear failure of the remaining first layer of maraging steel along the plastic hinge emanating from the tip of the Stage I crack.