Stress-intensity factor and crack opening for a linearly viscoelastic strip with a slowly propagating central crack

Abstract

The s t r e s s intensity factor and crack opening have been calculated for a linearly viscoelastic strip with a slowly propagating central crack. to a propagating crack is found by superposition. The edges of the infinitely longThe resultsThe response

Viscoelastic rocket grain fracture analysis

“…This can be calculated from equation (5), as has been done by Knauss and Dietman [15]. Equation (7) can also be found experimentally by conducting an experiment for which K~ does not change with time, i.e., in a biaxially stretched strip containing a crack at least as large as the strip width (2b) [11]. If Kx is available in numerical or graphical form but not in analytical form, equation (7) can still be evaluated.…”

“…Second, a fundamental experimental determination of crack velocity versus stress intensity factor must be made. This is the crack velocity that results when the stress intensity factor is held constant as in the case of the biaxial strip where the crack is large as compared to the strip width [11].…”

“…The Solithane 113 composition used for these tests was formulated on a 1 : 1 reactivity equivalence ratio basis of resin to catalyst. Previous work by other investigators [11,12] used a 50: 50 volume ratio. This formulation procedure minimized between batch properties due to lot-to-lot equivalence ratio variations of the Solithane 113 resin or CI 13-300 cure catalyst.…”

Simulation of First Mode Crack Propagation in a Viscoelastic Solid System Fuel Structure Using Crack Length-Temperature Superimposition

“…Application of finite element computer formulations to evaluate stress intensity factors for different fuel geometries are discussed in papers by Swanson [2]. Mueller provided a crack displacement stress intensity factor relationship for a cracked sheet [3]. Mueller and Knauss applied this work to fracture characterization of a linear viscoelastic material [4].…”

Μελετη Του Πεδιου Των Μετατοπισεων Σε Απειρες Πλακες Με Εσωτερικες Ρωγμες. Συνεπειες Στη Μελετη Της Θραυσεως

“…Το άνοιγμα των ρωγμών (COD),που μέχρι χώρα έχει μελετη θεί από πολλούς επιστήμονες, όχι μόνο θεωρητικά αλλά και πει ραματικά, |~WELLS, 1961, BURDEKIN AND STONE 1966, CD. FEAR-MEHOUGH 1968, E. SMITH 1970, MUELLER 1971, ROBINSON J.N. 1975, 76 THEOCARIS 1974, EGAN 1973, H. PISARSKI 1981] είναι από λυτα συσχετισμένο με τη θραύση των υλικών,αφού η μέτρηση του οδηγεί στον υπολογισμό του κρίσιμου συντελεστού εντάσεως των τάσεων Κ ΤΓ που είναι η χαρακτηριστική σταθερά για τη θραύση κάθε υλικού.…”