Three-dimensional interaction effects in internally multicracked pressurized thick-walled cylinder. Part 2: Longitudinal coplanar crack arrays

Journal Article · Thu Aug 01 00:00:00 EDT 1996 · Journal of Pressure Vessel Technology

DOI:https://doi.org/10.1115/1.2842201· OSTI ID:390221

Levy, C; Kokkavessis, N ^[1]; Perl, M ^[2]

---

1. Florida International Univ., Miami, FL (United States). Dept. of Mechanical Engineering
2. Ben-Gurion Univ. of the Negev, Beer-Sheva (Israel)

In the first part of this paper, the interaction effects among many radial, internal, semi-circular, and semi-elliptical cracks in a pressurized, thick-walled vessel were quantified. In the present paper, the mode 1 stress intensity factor (SIF) distribution for numerous longitudinal coplanar, internal, semi-circular, and semi-elliptical arrays of surface cracks in an infinite, pressurized, thick-walled cylinder are evaluated. The 3-D analysis is performed by the finite element (FE) method and the submodeling technique, employing singular elements along the crack front. The effects f dense and sparse interacting longitudinal coplanar crack arrays on the SIFs are studied for a wide range of crack depth to wall thickness ratios, a/t, from 0.05 to 0.6; and, for various ellipticities of the crack, i.e., the ratio of the crack depth to semi-crack length, a/c, from 0.2 to 2.0. An analysis is performed to determine the influence of the three major parameters--crack density, crack ellipticity, and crack depth--on the interaction effects between adjacent cracks. The results clearly indicate that crack density, and, in some cases, ellipticity have opposing effects on the SIF of longitudinal crack arrays as compared to radial crack arrays. As a result of these contrasting behaviors, thick-walled cylinders having combined longitudinal and radial crack arrays would need further study.

• Sponsoring Organization: USDOE
• OSTI ID: 390221
• Journal Information: Journal of Pressure Vessel Technology, Journal Name: Journal of Pressure Vessel Technology Journal Issue: 3 Vol. 118; ISSN 0094-9930; ISSN JPVTAS
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
CRACK PROPAGATION
CRACKS
PRESSURE VESSELS
STRESS INTENSITY FACTORS
THEORETICAL DATA
THREE-DIMENSIONAL CALCULATIONS