Dynamic stress-intensity factors for unsymmetric dynamic isochromatics

Kobayashi, A. S.

doi:10.1007/bf02325929

Cited by 25 publications

(14 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An analysis of the isochromatic and isoclinic patterns at fixed times [7,9,16] and the same length increments of cracks propagating in a stretched strip (Fig. 1c) indicates that the principal directions of the stress and strain tensors coincide as independent of the type of loading and the crack growth rate.…”

Section: Determination Of Dynamic Sifs By the Photoelastic Methodmentioning

confidence: 96%

See 1 more Smart Citation

Dynamic photoelastic study of wave fields in elastic plates with stress concentrators

Malezhik

Zirka

et al. 2005

Int Appl Mech

View full text Add to dashboard Cite

The method of dynamic photoelasticity is used to study the dynamic failure of structural members in the form of plates with a curvilinear (circular or elliptic) hole and an isolated crack under impulsive loading. The time-dependences of the stress intensity factors and the crack tip velocity are investigated for two types of models Introduction. Considerable advances have been made in the development of the theory and methods of solving static and dynamic problems for isotropic and anisotropic structural members weakened by stress concentrators of various types and shapes (holes, cutouts, cracks) [1-3, 11, 14, etc.]. The publications [2-6] provide the most complete account of the results obtained in using analytic and numerical methods to determine stress intensity factors (SIFs) for bodies with stress concentrators (cracks) under static and dynamic loading.Also of interest is to use the recent achievements in the field of classical and computational mathematics to solve dynamic problems for bodies of various configurations with holes and cracks. Note that experimental methods applied to analyze the dynamics of crack propagation [11] allow us to model their mechanical behavior in one way or another. An analysis of studies on the subject indicates that the mathematical description of the final stage (fast crack propagation) involves severe difficulties. All the available theoretical solutions are idealized ones and have been obtained, except in [2], by using the linear approach. The theoretical solutions cannot unambiguously explain the spasmodic crack propagation, the finiteness of the crack growth rate, microdamages ahead of the crack front, their influence on crack development, etc.The difficulties faced in measuring the parameters of fast-growing cracks restrict the number of experimental investigations in this field compared with the total number of strength studies. Practically all experimental studies in this area were conducted using the methods of dynamic photoelasticity and dynamic caustics [7][8][9][10][11][12][13][14][15][16].Of chief interest are studies of the diffraction of waves by stress concentrators (holes, cracks). In many cases, waves cause high local stress concentration at the hole periphery or crack tip. This phenomenon may lead, for example, to fast crack growth and even to real failure. However, the available experimental data are not yet sufficient to understand the mechanism of interaction of stress waves and stress concentrators, since the majority of studies address compressional waves. It is well known that other types of waves such as tensile waves can equally be generated in complex structures.The present paper studies the failure of plates with stress concentrators (holes and cracks) under single pulses of tension. Use is made of the dynamic photoelasticity method and high-speed photographic recording [9, 10].1. Choice of Model. When the crack growth rate is high, inelastic strains develop only within a small area near the crack tip; therefore, the only criterion for deciding on a...

show abstract

Section: Determination Of Dynamic Sifs By the Photoelastic Methodmentioning

confidence: 96%

“…Practically all experimental studies in this area were conducted using the methods of dynamic photoelasticity and dynamic caustics [7][8][9][10][11][12][13][14][15][16].…”

mentioning

confidence: 99%

Dynamic photoelastic study of wave fields in elastic plates with stress concentrators

Malezhik

Zirka

et al. 2005

Int Appl Mech

View full text Add to dashboard Cite

show abstract

“…Furthermore, this region *The superscript "dyn" to identify dynamic stress intensity factor will not be used in this paper, since all quantities refer to dynamic values. ahead of the running crack where lO-x >( ' increases with increases in crack speed and ox even under pure mode-II crack tip deformation [19]. This inevitable involvement of U' x forms the basis of incorporating Uox in the dynamic crack curving criteria presented in this paper.…”

Section: Elasto-dynamic Crack Tip Stress Fieldmentioning

confidence: 92%

“…With the development of a data reduction procedure [193 for evaluating dynamic KII together with K I and ox values, it became possible to investigate the above criteria by extracting K, and KII and rox from the previously recorded dynamic isochromatics surrounding running crack tips of curved cracks. An optimization method developed by the authors based on the overdetenninistic least square procedure was also used to extract the dynamic three parameters K I , KII and qox from the recorded dynamic photoelastic pattern surrounding a running crack [19,20).…”

Section: Data Reduction Proceduresmentioning

confidence: 99%

Dynamic crack curving—A photoelastic evaluation

Ramulu

Kobayashi

1983

Experimental Mechanics

Self Cite

View full text Add to dashboard Cite

“…The isochroraatic data were reduced by least square fitting to the recorded dynamnc is6ciromatics a theoretical mixed-mode, dynamic crack tip stress field with disposable parameters of KI, KII and sigmaox [19). The characteristic crack tip distance, to, was then computed by Equation (1).…”

Section: Polycarbonate Fracture Specimensmentioning

confidence: 99%