Manufacturing Technology Today

J. R. K. Murthy ¹, L. Hari Krishna ¹, C. Gajendran ¹

Affiliations
1 Central Manufacturing Technology Institute, Tumkur Road, Bangalore-560022, IN

Abstract

Elastomers are special type of polymers, which are made of long, flexible or string like molecules. Each chain is joined to the nearby chains, known as crosslinks. The process known as Vulcanization adds these crosslinks. The excellent properties of application of these materials make them applicable in variety of fields. Depending on the component application and the type of hyperelastic material thus used, appropriate tests are conducted and the stress-strain data is recorded and the materials constants are calculated using the curve fitting procedures provided by the finite element software. These constants are further used in the non-linear analysis of a trunk door seal. The analysis showed that the stress in the seal is 1.286 N/mm² for a deformation of about 63mm when the door operates.

Full Text

     

J. R. K. Murthy ¹, P. Sundeep Rao ¹, S. Prasad ¹, C. Gajendran ¹

Affiliations
1 Central Manufacturing Technology Institute, Bangalore, IN

Abstract

Flexible mirrors widely used for wave front correction, can be deformed to any desired complex shape through the application of control voltages. Finite element method has been used for computing the value and location of voltages. The thickness of the mirror being very small, it behaves nonlinearly. The paper presents the method of computation of influence matrix to relate deformed shape with the pressure to be applied to obtain the deformed shape.

Full Text

     

J. R. K. Murthy ¹

Affiliations
1 Central Manufacturing Technology Institute, Tumkur Road, Bangalore-560 022, IN

Abstract

It is common in some precision machines that columns which carry devices like spindle head, require to be indexed about their axes. This is required for facilitating desired device orientation relative to a reference as for instance the job that is to be machined. Once oriented however, the column needs to be firmly clamped to prevent any further rotation, during machining time. Firm clamping is vital because any slip would adversely affect the workpiece.

Full Text