Analysis of stress concentration around a spheroidal cavity under asymmetric dynamic loading

• Published in: International journal of solids and structures 2011-07, Vol.48 (14), p.2255-2263
• Main Authors: Paskaramoorthy, R., Bugarin, S., Reid, R.G.
• Format: Article
• Language: English
• Subjects: Dynamic loading; Dynamic tests; Dynamics; Exact sciences and technology; Fatigue (materials); Fatigue failure; Fracture mechanics (crack, fatigue, damage...); Fundamental areas of phenomenology (including applications); Holes; Inclusions; Loads (forces); Physics; Porous material; Solid mechanics; Static elasticity (thermoelasticity...); Stress concentration; Structural and continuum mechanics; Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...)
• ISSN: 0020-7683; 1879-2146
• DOI: 10.1016/j.ijsolstr.2011.04.001

The fracture and fatigue properties of porous materials are strongly influenced by stress concentrations around the pores. In addition, failure of structural components initiates at locations of high stress concentration which is often caused by holes, inclusions or other discontinuities. In view of this, the stress concentration around a spheroidal cavity embedded in an elastic medium is studied under dynamic loading conditions. While solutions abound for static loads, only limited solutions exist for dynamic loads. The stress field around a spheroidal cavity is determined by using a hybrid methodology that combines the finite element technique with a spherical wave function expansion method. The stress concentrations within the matrix are found to be dependent on the frequency of excitation, aspect ratio of the cavity and the Poisson’s ratio of the matrix. The study reveals that dynamic stress concentrations can reach much higher values than those encountered under static loading.