11. Less ductile materials such as medium to high carbon steels do not have a well-defined yield point . 12. The formation of a L�ders band is preceded by a yield point and a drop in the flow stress. 13. Once the yield point is passed, some fraction of the deformation will be permanent and non-reversible. 14. Such a curve can be labelled with specific identifiable point such as elastic limit, yield point and fracture. 15. Yield occurs when the maximum principal strain reaches the strain corresponding to the yield point during a simple tensile test. 16. Brittle materials such as concrete or carbon fiber do not have a yield point , and do not strain-harden. 17. It is proposed that yield occurs when the distortion component exceeds that at the yield point for a simple tensile test. 18. If the strain is great enough to the ligaments past the yield point , then the ligament becomes damaged, or sprained. 19. For this type of steel, the yield point is defined by the level at which the stress strain curve becomes horizontal. 20. Therefore, it is difficult to tell which of the two specimens is closer to the yield point or has even reached it.
