STRESS AND STRAIN.

Auckland Star, Volume LI, Issue 206, 28 August 1920, Page 7

STRESS AND STRAIN.

THE STRENGTH OF MATERIALS PROBLEMS FOR SOLUTION. (Received 9 a.m.) LONDON, August 27. Professor C. F. Jenkins, in an address on engineering before the British Association, said that the time had come ' to thoroughly overhaul nnd revise the I fundamental data on which the strength j and suitability of materials was based, j During the war aeroplane construction revealed remarkably how inadequately problems of stress and strain had been , solved, especially in regard to anisotropic materials, andl in lesser degree with isotropic materials. There was practically no theory in a form available for tho engineer whereby the strength of timber could be satisfactorily calculated. The outcome of research in the war yielded some reasonably aecurnte data Professor Jenkins urged the necessity for undertaking the fullest research work on the subject.— (A. and N.Z.) Isotrophy is the term used when a peculiar physical property of a body has the same value in nil directions about a point. The converse term is anistrophy. Thus Professor Jenkins makes it clear that too little is known of breaking and crushing strains both of grained substances like wood, and of similar strains in metals and alloys.