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