Plastic deformation environmental factors

In literature, several metallic systems have been proposed for their wider development and use in buildings and structures lead extrusion devices, torsion beams, dampers with bending deformation. A wide variety of different t3q)cs of devices have been developed that utilise bending, shear, or extensional deformation modes into their plastic range. Important desirable features ofthese systems are stable behaviour, long-term reliability, and generally good resistance to environmental and temperature factors. 

It is known that the concentration of tie chains within lamellae is one of important factors controlling crack initiation. However, it is also important to understand the effect of the environment on the ESCR of materials. Crack initiation and slow crack growth is normally regarded as a semi-brittle or brittle phenomenon. In the case of environmental stress cracking a certain amount of ductile deformation occurs which is governed by the nature of the test media. Plasticization of HDPE due to the diffusion and sorption of IGEPAL is an important component of the ESC mechanism. 

---