31. It is usually evaluated as the tear-yield ratio, the ratio of tear resistance to yield strength . 32. In general, as the yield strength of a material increases, there is a corresponding reduction in fracture toughness. 33. An example of undesirable work hardening is during machining when early passes of a yield strength , and tensile strength. 34. Cancellous bone has a higher yield strength of cancellous bone has also been investigated, using high resolution computer models. 35. In any case the result is a more ductile material but a lower yield strength and a lower tensile strength. 36. For H116 base material, measured at ambient temperature, yield strength decreases from to and ultimate strength from. 37. Methods have been devised to modify the yield strength , ductility, and toughness of both crystalline and amorphous materials. 38. Increasing the dislocation density increases the yield strength which results in a higher shear stress required to move the dislocations. 39. A cyclic load well below a material's yield strength can cause failure if it is repeated through enough cycles. 40. Mechanical properties of materials include the yield strength , tensile strength, fatigue strength, crack resistance, and other characteristics.