• Vishnu Saini

Composite materials are widely used in different areas of science for many applications. They are being used prominently in aerospace industry. There is significant importance of testing of these composite materials, as they could be liable to failure due to temperature variation, which can range up to cryogenic temperatures and that must be sustain by material exposed to that condition. In this work, tensile strength of composite materials has been observed by using double walled vacuum chamber, which is designed for the Universal Testing Machine (UTM). A chamber with two walls, which are separated by vacuum in between, made up of material SS316. The chamber has been designed in such a way that it can accommodate a moving shaft, at the bottom part of the chamber that can apply a tensile load on the specimen whereas the upper shaft connected to the chamber has been fixed. The one end from the cryogenic chamber has been fixed to the jaws of the UTM and to another end, chuck is fitted, so that it can hold the specimen at the time of test. The chamber provides a cryogenic environment while testing of the specimen. Cryogenic temperature can be obtained in the chamber by the spraying of liquid nitrogen (LN2) into the chamber. To create an isolated environment, a vacuum pump having capacity 10-3 mbar has been used to create vacuum between the walls of the chamber. In the chamber for the collection of data pertaining to temperature, two digital thermocouples has fitted. A high resolution camera incorporated inside the chamber which confirm us the condition of occurrence of fracture. Design of this cryogenic chamber has been done in the designing module of CATIA. Further, thermos mechanical analysis is done on the chamber to investigate the stresses developed in SS316 LN under cryogenic conditions. The testing of composite materials is an important aspect to be considered for the development of aerospace compatible materials. These materials experience cryogenic conditions which affect the mechanical and thermal properties. Further, there is a chance that the failure of these materials may occur at cryogenic conditions. Hence, in this work the testing of composite materials has been done in cryogenic conditions with the help of an environmental chamber.

Cryogenics, Environmental chamber, Testing, cryogenic condition, Composite material.

"Development of Environmental Chamber for Testing of Composite Materials at Cryogenic Conditions", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 4, page no.1135-1143, April-2019, Available :http://www.jetir.org/papers/JETIREL06166.pdf

"Development of Environmental Chamber for Testing of Composite Materials at Cryogenic Conditions", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 4, page no. pp1135-1143, April-2019, Available at : http://www.jetir.org/papers/JETIREL06166.pdf