Variation Of Stress Distribution Research Articles

Thermal stresses in anisotropic discs

A general solution is given for the elastic thermal stresses in a solid or hollow anisotropic disc of constant thickness when subjected to a temperature rise which varies symmetrically in an axial direction and arbitrarily with the radius. Graphs demonstrate the variations of stress distribution and maximum stresses with the degree of anisotropy and other parameters.

Time-dependent variation of the stress distribution in a long strip compressed oppositely with elastic flat punches

A time-dependent variation of the stress distribution in a long strip compressed oppositely with elastic flat punches is analysed by using a combination of model materials such as Araldite for the punch and softened celluloid for the strip. The stress analyses in the elastic punch and the plastically deforming strip are performed with the usual photoelasticity and the photorheological stress analysis proposed by one of the present authors at 2, 40, 160 and 300 min after loading. The time-dependent variations of stress distributions in the punch and strip, especially on their contact surfaces, are investigated in detail and compared with the corresponding result for a semi-infinite plate compressed with an elastic flat punch on a part of its straight boundary as obtained previously.

The effect of plasticity on the stress-distribution of thin notched plates in tension

An explicit solution of the stress-distribution in notched plates under conditions of plane-stress is given in the elasto-plastic domain of straining. The material is considered as elastic-perfectly plastic and isotropic obeying the Mises yield condition and the Prandtl-Reuss incremental stress-strain relations. Elastic and plastic components of strains are determined by using information from birefringent coatings cemented on the surface of the specimens and observed in normal circularly or linearly polarized light. These measurements are complemented with data from an electrical analogy which yield the ϵ x -strain distribution. Thin fat plates containing either symmetrical semi-circular grooves or deep notches of various flank angles are subjected to a uniform tension. Four cases of flank angles are considered lying between 0 and 120 deg. The minimum width of all plates is taken constant and equal to the half of the width of the plates. The analysis of the state of stress is restricted to the initial part of the loading path from an incipient plastic deformation up to an impending plastic flow. The variation of stress distribution with the evolution of plastic enclaves is studied and the influence of the severity of notches on the mode of spreading of plastic zones is determined.

Influence of stress distribution on fatigue strength of adhesive-bonded joints

A study was made of the fatigue behavior of three types of 2024-T3 aluminum-alloy adhesive-bonded joints: single-lap joint, scarf joint and butt joint bonded with two kinds of adhesives, a vinyl-phenolic type, FM-47 and a nitride rubber-phenolic type, Metlbond 4021. Two different modes of fatigue failures of the single-lap joints, i.e., sheet-metal failure and adhesive-bonding failure, were caused by the different stress components in the joint. The influence of the variations of stress distribution caused by the difference in mechanical properties of the adhesive, geometry of the joints, and the type of loading on fatigue strength of the adhesive-bonded joints, were analyzed.

Deflection and Stresses in Beams Subjected to Bending and Creep

Abstract This paper presents theories for the determination of deflections and stresses in beams subjected to bending and creep. The theories are based on a creep-stress-time relation in simple tension which gives an accurate fit of most test data. The theory takes into account the variation in stress distribution in bending with time. For this purpose a time-hardening theory is used to express the stress variation or stress relaxation of each fiber in bending. A comparison between actual creep deflections for Plexiglas specimens subjected to pure bending and values predicted by the proposed theory shows good agreement between experimental and theoretical results. The creep behavior for other materials in tension indicates that this method could be used for predicting bending creep deflections for these materials. The application of the theory to the determination of deflections in various kinds of beams is also explained.