Balanced Biaxial Tension (BBT) Testing_Nakajima
While the uniaxial tension test is the most dominant material test type, most sheet metal forming operations involve biaxial tensile deformation, and thus it is important to characterize materials under such loading conditions. We perform several types of biaxial tension tests for this purpose
- Custom tests performed with several approaches: bulge test, Nakajima test, Marciniak test, and cruciform biaxial test
- Material screening based on biaxial energy absorption
- Construction of effective biaxial stress/strain curves
- Evaluation of fracture strain limits under balanced biaxial loading with stress triaxialities approaching 0.67 (support the calibration of fracture models _ GISSMO)
- Quasi-static rates, as well as intermediate rates
