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Since connecting rods are made of high-strength materials, they generally fail under tensile forces due to reaching the fracture limit state. High-strength materials are more likely to fail in fracture mode before attaining the plastic collapse strength. Collapse and fracture are competing conditions, and the one satisfied first will prevail.
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#Unity strength of an impulsive force cracked#
In case of a cracked element, it may fail due to reaching the plastic collapse or fracture condition. Strength failures of load bearing elements can be either of the yielding-dominant (ductile) or fracture-dominant (brittle) types. Before presenting the idea of the current invention, it is necessary to discuss the engineering principles on which the invention stands. Moreover, some techniques are slow, costly, and technically very elaborate. Despite the improvements, some disadvantages still exist such as: plastic deformation, lack of flexibility in adapting the same technique to different sizes of connecting rods, repeated breakage of force exertion elements of the machine, and poor quality of the fractured connecting rod. The use of big force has a negative effect on the quality of the fractured connecting rod, especially, with large size connecting rods in a high production environment. Since connecting rods are made of high strength materials, the fracturing force is required to be of big magnitude. Some of these methods attempted to overcome the difficulty of fracturing such high strength material by reducing or weakening the cracking area, by using techniques, such as, the cryogenic cooling and the electron beam hardening, which have a deleterious effect on material performance. However, most of the known methods for fracturing the connecting rods are based on the same principle: application of an “outward pressure” to the crank bore till the generated stresses are high enough to fracture the connecting rod. (v) Actuating expanding mandrels using a wedge arrangement as in U.S. (iv) Applying a static or an impulsive force acting perpendicular to the fracture plane as in U.S. (iii) Using heat treatment or freezing to embrittle the fracture area as in U.S. (ii) Providing holes in the fracturing plane through which the fracturing force is introduced as in U.S. (i) Passing an electron beam along a desired splitting plane as in U.S. Many methods have been used in fracturing connecting rods, that include: 20, 2003, which is in turn a divisional of application Ser.
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This application is a divisional of copending application Ser.
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