STRENGTH OF MATERIALS

Dominion, Volume 13, Issue 288, 30 August 1920, Page 5

STRENGTH OF MATERIALS

PROBLEMS OP STRESS AND STRAIN. :

London, August 26. Professor C. F. Jenkins, in an address to the Engineering Section of tho British Association, said the time had come to thoroughly overhaul and revise tho fundamental data on which tho calculations of the strength and suitability of materials was based. During the war, aeroplane construction had revealed in a remarkable way how inadequately the problems of stives and strain had been solved, especially in regard to anisotropic _ materials and in a lesser degree with isotropic materials. There was practically no theory in a form "available for the engineer by which tho strength of timber conld bo satisfactorily calculated. Researohes during the war had yielded some reasonably accurate, data. Professor Jenkinß urged the necessity of undertaking tho fullestresearch work on the subject.—Aua.-N.Z- Cable Assn. Tlsotropic substances are those whioK have their physical properties—for instance, elasticity and strength—similar in all directions; nnisotropio bodies have their properties difl'oront in various directions. A piece of steel is isotropic in elasticity and strength, wood is anisotropic, being stronger along the grain than across it.] •