Brittle fracture mechanics

Part 1 of ebook "Introduction to contact mechanics (Second edition)" provides readers with contents including: Chapter 1 - Mechanical properties of materials; Chapter 2 - Linear elastic fracture mechanics; Chapter 3 - Delayed fracture in brittle solids; Chapter 4 - Statistics of brittle fracture; Chapter 5 - Elastic indentation stress fields;...

118p giangdongdinh 28-05-2024 3 2   Download

The brittle fracture mode by cleavage is accounted for by Ritchie–Knott–Rice's deterministic maximum principal stress criterion (Ritchie et al., 1973). The wellknown problem of mesh dependence associated with softening material behavior is remedied by using an integral type nonlocal formulation similar to that presented in Tvergaard and Needleman (1995).

20p guernsey 28-12-2021 10 0   Download

The numerical wedge splitting tests show that in the case of brittle materials, the lower post-failure stress limit defined in the concrete damaged plasticity model resulted in energy consumption for crack propagation exceeding the defined fracture energy (114% higher in the case of a brittleness number of 4.4).

9p guernsey 28-12-2021 9 0   Download

This article presents a computation algorithm to predict the lifetime of brittle materials like concrete which depends on the distribution of micro-crack in the materials. The proposed model is based on subcritical crack growth using the linear elastic fracture mechanics (LEFM) approach. The algorithm considers both tensile and shear fracturing.

7p cothumenhmong12 08-07-2021 13 0   Download

A new fracture test specimen is suggested and analyzed using finite element method. The mode I and mode II stress intensity factors as well as the T-stress were calculated for three geometries and loading conditions.

6p tohitohi 19-05-2020 13 1   Download

The mechanical strength of Zircaloy-4 increased with the formation of the ODS layer. The ring-tensile strength of Zircaloy-4 increased from 790 to 870 MPa at room temperature, from 500 to 575 MPa at 380
C, and from 385 to 470 MPa at 500
C. Strengthening became more effective as the test temperature increased. It was noted that brittle fracture occurred at room temperature, which was not observed at elevated temperatures.

5p minhxaminhyeu3 25-06-2019 12 1   Download

In this paper, the finite element for cohesive crack for quasi-brittle materials is constructed by XFEM, which allows incorporation of the displacement discontinuities in the element. The algorithm of construction and procedures for involving this finite element into code Cast3M are presented. The numerical calculations in fracture mechanics are presented to demonstrate the benefits of the proposed implementation.

10p thienthanquydu 17-10-2018 39 1   Download

The fracture to toughness ratio (bulk modulus/shear modulus) in sodium borohydride varied from 1.91 to 1.62, which shows its behavioral change from ductile to brittle on increasing the temperature. Then, ultrasonic Gruneisen ¨ parameters have been computed with the use of elastic constants in the temperature regime 100- 300K. The obtained results have been discussed in correlation with available experimental and theoretical results.

14p thuyliebe 08-10-2018 21 0   Download

The following will be discussed in this chapter: Introduction, transformation of plane stress, principal stresses, maximum shearing stress, mohr’s circle for plane stress, general state of stress, application of mohr’s circle to the three- dimensional analysis of stress, yield criteria for ductile materials under plane stress, fracture criteria for brittle materials under plane stress, stresses in thin-walled pressure vessels.

40p nomoney9 04-04-2017 57 2   Download

Fractures are ubiquitous in the brittle lithosphere in the upper part of earth’s crust. They play a critical role in the transport of fluids. Moreover, all major discovered geothermal reservoirs and a considerable number of petroleum reservoirs are in fractured rocks. This restates the importance of studying multiphase flow behavior inside the opened fracture space. From the engineering point of view, a rock fracture as defined here is simply a complex-shaped cavity filled with fluids or solid minerals. Therefore it is understood to include cracks, joints, and faults.

0p aries23 29-09-2012 88 22   Download