Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 15 of 15 for “"Multiaxial Stress"”.
-
Numerical Simulation of Reinforced Concrete Subjected to Multiaxial Stress Conditions
… (2) crack modeling in concrete; (3) interface stress and stiffness transfer across the crack; and (4) finite element implementation of the findings into an integrated program. Comparison of numerical results with actual test results are presented to verify this proposed algorithm.
-
Mechanical response of polyether polyurethane foams under multiaxial stress and the initial yielding of ultrathin films
… measure the mechanical response in the form of a stress-strain curve or a force-displacement curve; in several tests we use a Digital Image Correlation (DIC) technique to compute the strain fields on the surface of the specimen. For some loading cases, including uniaxial compression along the rise …
-
Failure Criteria and Cumulative Damage in Fatigue Under Multi-Axial Stress Conditions
Previous investigations into fatigue under multiaxial stress, and also cumulative damage under uniaxial stress, are discussed in conjunction with the parameters relevant to the present experimental investigation. A biaxial fatigue machine is described which can subject thin wall tubes to …
-
Mechanical Behavior of Metals Under Triaxial Stress: Apparatus and Experiments
Under combined axial-stress/external-pressure loadings, a solid specimen experiences a truly three-dimensional, homogenous stress state comprised of a uniform axial stress in conjunction with radial and circumferential stresses equal to the negative of the pressure, -P. Through independent computer …
-
Computational and experimental study of instrumented indentation
… relation can be estimated from the complex multiaxial stress state induced by indentation. Analytical formulations form a framework for parametric finite element analysis. The algorithms are established to predict indentation response from a constitutive relation (hereafter referred to as …
-
Constitutive modeling of the finite deformation behavior of membranes possessing a triangulated networked microstructure
… a specific example, a constitutive model of the stress-strain behavior of the red blood cell membrane is developed. The mechanical behavior of the membrane of the red blood cell is governed by two primary microstructural features: the lipid bilayer and the underlying spectrin network. The lipid …
-
A study of fretting fatigue incorporating sharp corner contact geometry.
… of dominant fretting cracks by influencing the stress distributions in the region of the contact.The current research programme presents a method of analysing flat contacts containing sharp comers. The method includes the development of a finite element solution capable of accurately predicting …
-
The Deformation and Fracture of Thick Thermal Barrier Coatings
… have to understand the materials response under multiaxial stress states, the deformation mechanisms, failure criteria, and the constitutive relations. In this study, the deformation behavior, the deformation mechanisms, and the failure criteria were investigated. The results shows that under …
-
An experimental investigation of homogeneous fatigue damage in a random short-fiber composite under combined tension-torsion loading
… conducted to examine the effects of the state of stress on the fundamental nature of distributed fatigue damage in a random short fiber composite. The project consists of two different tasks: first, to develop a new experimental method, for conducting combined shear and axial fatigue damage in …
-
On mechanics and microstructure of weak snow layers
… experiments further constrained failure under multiaxial stress states and indicate that, for the tested buried surface hoar weak layers, failure can be described by closed, approximately elliptical envelopes in the shear stress-compressive stress space. These findings provide practical …
-
Non-linear analysis of infilled frames.
… developed. Failure criteria for concrete under multiaxial stress and also failure criteria for masonry under uniaxial compression are developed. The non-linear elastoplastic behaviour of concrete is modelled using the concept of equivalent uniaxial strain and the model is extended for cracked …
-
The influence of cementation on liquefaction resistance of sands
… and are not capable of modeling the effects of multiaxial loading. In this investigation, there were two major objectives. The first involved the development and fabrication of a new three~dimensional shear device with the capability of applying load to cemented sands with a minimum of stress …
-
Role of cracks in creep of brittle, polycrystalline, structural ceramics
… but crack-free material, due to the local stress field associated with the cracks and the resultant transfer of stress to the adjacent, crack-free material. Creep rates due to these mechanisms were quantified for simple crack geometries. It was shown that the contribution of cracks can …
-
Validation and application of the small sample punch test for toughness measurement of steels
… interpretation of the inhomogeneous and multiaxial stress and deformation distribution in an SPT sample during and after testing. A key concern in proving the reliability of the SPT is the determination of the onset of cracking during the test, hence the introduction of Digital Image …
-
Fretting Fatigue Characterization of Steel Bolted Connections
Fretting fatigue is a multiaxial stress problem, which occurs on contacting components under normal pressure while they are subjected to cyclic loads and oscillatory relative movement of small amplitudes at the same time. Slip-critical bolted connections are commonly used in repetitive loading …