Based on the continuum damage mechanics theory of concrete materials under fatigue loading; a phenomenological fatigue damage model due to nuclei-propagation of microdefects, microvoids and fractal of rendered concrete in conjunction with more compliant are developed by utilizing internal variable theory of thermodynamics. Experimental data from fatigue test were employed to verify the model and results

Introducing crack-like notches is essential for investigating the mechanical properties of pre-cracked structures because fatigue pre-cracking occasionally fails to ensure some rigorous investigation conditions. However, the results obtained by previous studies related to crack-like notches under small-scale yielding are invalid for shallow notches with extensive plasticity, particularly when plastic

In this paper, a new procedure for manufacturing the plain and polyvinyl alcohol (PVA) fiber-reinforced ultra-high-performance concrete (UHPC) is introduced to improve its workability and to reduce its shrinkage behavior. To determine its fracture characteristics, a series of three-point bending tests are performed with the notched beam structures made of the produced UHPCs. In addition, with the rising

The three-point bending tests of concrete specimens at different temperature levels (20 ℃, 0 ℃, −20 ℃, and −40 ℃) were performed using a low-temperature fracture test system. The 3D digital image correlation (3D-DIC) technique was employed to measure the surface deformations of the beams during fracture process. Combined with the displacement fields obtained from 3D-DIC, the crack propagation lengths

Hydrogen embrittlement (HE) is widely believed to be harmful to engineering structures made of ferritic steel, particularly in the presence of pre-cracks. However, in this study, the ultimate tensile strength (UTS) of shallow pre-cracked cylinder specimens made of interstitial-free (IF) steel, which represents a standard microstructure of ferritic steel, does not decrease in the hydrogen environment

The aim of this paper is to test the influence of different crack path models, from oversimplification currently used in literature of a straight crack front orthogonal to the specimen sides to a realistic 3D crack path. On the basis of experimental features observed for Ti17 and Ti6242 alloys under multiaxial loading, a sensitivity analysis is proposed to address the impact of realistic 3D crack path

The configurational force concept is known to describe adequately the crack driving force in linear fracture mechanics. It is unclear however, if and how the crack driving force can be defined in the case of elastic-plastic material properties. In metal plasticity, many materials exhibit hardening effects when sufficiently large loads are applied. Von Mises yield function with isotropic and kinematic

Peridynamics (PD) and extended finite element method (XFEM) are coupled in the explicit integration scheme to study the 2D dynamic fracture problems. The advantages of PD for the crack propagation and XFEM for the strong displacement discontinuity description of the crack are combined together. The proposed method can improve the computation efficiency in comparison of the pure PD, and can avoid using

A triangular cracked plane element is proposed for application in fracture mechanics’ problems. The new element is based on the strain formulation and the compliance concept. To formulate the non-cracked element, the assumed strain formulation is used. Due to strain formulation, the derived non-cracked element is free from shear parasitic error. Moreover, it demonstrates very low sensitivity to the

In rock excavating and mining, blasting a row of circular holes is a common practice. It is often observed that cracks emanating from two adjacent holes tend to avoid each other when closely approached and form a hooked or butterfly-shaped loops. Five crack models were designed in this paper to study the propensity of forming the hook pattern. The five models are to simulate geometric imperfection

In the context of increasing use of adhesive bonding for mechanical assembly, there is a need for reliable design tools. Both energetic and stress based conditions are necessary to predict the strength of bonded joints, which explains the use of a coupled criterion. The application of the criteria was performed by using Finite Element Analysis. Results obtained numerically were compared to experimental