... A large building in Denver, Colorado was constructed in 1999 with exterior insulation and finish system (EIFS) cladding. About a year after completion, the lamina started to debond from the foam on the darker-colored EIFS panels. Tests were conducted to determine the cause of the delamination...

... Recently, a knee prosthesis containing an electron beam irradiated (58 – 72 kGy, nominal dose of 65 kGy), melt-annealed, highly crosslinked UHMWPE (HXPE) tibial insert has been developed. In the present study, the wear and delamination resistance of the HXPE tibial insert and its fatigue...

... stresses and the singularity parameters in the LSI device significantly depend on it. Shape design to decrease the Weibull stress values would be effective to improve the LSI devices reliability. interface strength delamination dissimilar material joints LSI devices package geometry local...

... The mixed-mode bending test has been widely used to measure delamination toughness and was recently standardized by ASTM as Standard Test Method D6671-01. This simple test is a combination of the standard Mode I (opening) test and a Mode II (sliding) test. This test uses a unidirectional...

... performed using the double-cantilever beam (DCB), four-point end-notch flexure (4ENF) and mixed-mode bending (MMB) configurations. Delamination initiation values were obtained as well as propagation values. The specimens were made of 24 layers of IM7/8552 plain-weave fabric. The results were compared...

... The objective of this work was to relate damage mechanisms, gleaned through electron microscopy, to delamination loci generated using fracture toughness (Mixed-Mode Bend) tests. From this, mixed-mode criteria were ranked using the ϰ 2 method (goodness of fit). The shapes of the failure loci (G...

... loading conditions are investigated. Special emphasis is on initiation of matrix rollers and striations, two features indicative of Mode II fatigue failure. The initial mechanisms for delamination in this material under static and fatigue loading were found to be the same; the development of angled cracks...

... The main objective of this work was to investigate and predict the behavior of damaged structural elements (skin-stringer panels). The study combined characterization through testing with fractographic analysis, and analysis of delamination using the finite-element method. The experimental...

... the energy release rates. This procedure was not time efficient, and hence, less appealing. Finally, a third procedure was developed to calculate mixed-mode energy release rates as a function of delamination lengths. This procedure required only one nonlinear finite-element analysis of the specimen...

... marcelled areas), although for some of the specimens the surface marcels were very obvious, and for others they were much smaller. The specimens failed by first developing cracks through the marcels at the surfaces, and then delaminations grew from those cracks, in both directions. Delamination failure...

... Results are presented from a study on the effect of friction on the Mode II delamination toughness as obtained by three- and four-point bend end-notched flexure tests. Finite-element analyses are used to assess the effect of friction on the compliance and energy release rate of the two types...

... to pavement characterization. pavements pavement management Ground Penetrating Radar GPR thickness quality control stripping delamination voids Kenneth 1L Maser1 Pavement Characterization Using Ground Penetrating Radar: State of the Art and Current Practice Reference: Maser, K. R., "Pavement...

... A study was conducted to improve upon currently used test procedures for determining the Mode I, Mode II and mixed-mode delamination toughness of ceramic matrix composite materials. Test methods and specimen geometries were chosen that may be used to test unidirectional or multidirectional...

... on the interface between two anisotropic elastic half-spaces is considered. A formal solution is obtained by using the Stroh method in two dimensional elasticity in conjunction with the Fourier transform method. To illustrate the solution procedure, an elliptical delamination in a cross-ply composite is solved...

... A stochastic model is used to predict the growth of delamination in graphite/epoxy laminates subjected to cyclic loading. The advantage of this model is that both the mean and variance associated with the growth of delamination is predicted. Understanding and predicting the variability...

... parallel to the fibers in that ply, associated with delaminations emanating from these splits. A free-edge delamination model was used to explain the type and extent of the major delaminations caused by the preload/impact combinations. composites damage resistance preload instrumented impact...

... The singular-field-based mode-mix decomposition procedure is assessed for its ability to accurately predict delamination growth in various test geometries. Initially, toughness versus mode mix is obtained from laminates with delaminations at their midplanes. These results are then used...

...-dimensional (Q-3-D) finite element analysis was conducted on each of the specimen configurations to determine the interlaminar shear stress at failure. From this analysis, s 23 was found to be 107 MPa for this material. composite materials fracture (materials) delamination fatigue (materials...

... regions. fatigue (materials) composite materials graphite/epoxy delamination crack propagation rate fracture mechanics stress ratio Mode II end-notched flexture end-loaded split fracture (materials) Keisuke Tanaka I and Hiroshi Tanaka I Stress-Ratio Effect on Mode II Propagation...

... This study focuses on the mode dependence of delamination growth under cyclic compressive loads in cross-ply composite plates. The model proposed makes use of an initial postbuckling solution derived from a perturbation procedure. A mode-dependent crack growth criterion is introduced...