Micro-mechanical analysis of matrix crack-induced delamination in cross-ply laminates in tension

2020 ◽  
Vol 243 ◽  
pp. 112202 ◽  
Author(s):  
Chen Fu ◽  
Xi Wang
Keyword(s):  
Mechanical Analysis ◽  
Matrix Crack

A Two-Parameter Model of FRP Laminates Stiffness Reduction

2011 ◽  
Vol 236-238 ◽  
pp. 1187-1194 ◽  
Author(s):  
Tai Feng Zhang ◽  
Xiao Hua Yang ◽  
Wen Sheng Sun ◽  
Zeng Jie Cai
Keyword(s):  
Fiber Strength ◽  
Mechanical Analysis ◽  
Matrix Crack ◽  
Fibre Breakage ◽  
Damage Models ◽  
Stiffness Reduction ◽  
Reinforced Polymer ◽  
Proposed Model ◽  
Fibre Reinforced Polymer ◽  
Two Parameter

Matrix crack and fibre breakage are the main damage models of the fibre reinforced polymer (FRP) laminates under cyclic loading. In this paper, meso-mechanical analysis is used and a two-parameter model is developed to describe the stiffness reduction. Based on the probability distribution function of fiber strength, the evolution of fibre breakage is deduced. Then with the help of the damage evolution, the stiffness reduction of laminates can be predicted. As an example, the stiffness reduction of grass fibre reinforced polymer (GFRP) laminate is made and the simulation results show that the proposed model has good capacity to describe the stiffness reduction of FRP laminates resulted in the combination of matrix crack and fibre breakage.

Light-cured dental composites characterization by Electron Microscopy

1990 ◽  
Vol 48 (4) ◽  
pp. 428-429
Author(s):  
B. M. Culbertson ◽  
M. L. Devinev ◽  
E. C. Kao
Keyword(s):  
Electron Microscopy ◽  
Mechanical Analysis ◽  
Service Performance ◽  
Dental Composite ◽  
Dental Composites ◽  
Neat Resin ◽  
Scanning Calorimetry ◽  
Research Meeting ◽  
Formulation Variables

The service performance of current dental composite materials, such as anterior and posterior restoratives and/or veneer cements, needs to be improved. As part of a comprehensive effort to find ways to improve such materials, we have launched a broad spectrum study of the physicochemical and mechanical properties of photopolymerizable or visible light cured (VLC) dental composites. The commercially available VLC materials being studied are shown in Table 1. A generic or neat resin VLC system is also being characterized by SEM and TEM, to more fully understand formulation variables and their effects on properties.At a recent dental research meeting, we reported on the differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) characterization of the materials in Table 1. It was shown by DSC and DMA that the materials are substantially undercured by commonly used VLC techniques. Post curing in an oral cavity or a dry environment at 37 to 50°C for 7 or more hours substantially enhances the cure of the materials.

Mechanical Analysis of Suture Attachment Methods in Toggle Suture Constructs

2018 ◽  
Vol 31 (S 02) ◽  
pp. A1-A25
Author(s):  
Kathleen Kraska ◽  
Joshua Jackson
Keyword(s):  
Mechanical Analysis

Rubber–Road Contact: Comparison of Physics-Based Theory and Indoor Experiments

2016 ◽  
Vol 44 (3) ◽  
pp. 150-173 ◽  
Author(s):  
Mehran Motamedi ◽  
Saied Taheri ◽  
Corina Sandu
Keyword(s):  
Rough Surface ◽  
Practical Importance ◽  
Surface Profile ◽  
Surface Characteristics ◽  
Mechanical Analysis ◽  
Friction Model ◽  
Rubber Friction ◽  
Optical Profilometer ◽  
Viscoelastic Modulus ◽  
Longitudinal Slip

ABSTRACT For tire designers, rubber friction is a topic of pronounced practical importance. Thus, development of a rubber–road contact model is of great interest. In this research, to predict the effectiveness of the tread compound in a tire as it interacts with the pavement, the physics-based multiscale rubber-friction theories developed by B. Persson and M. Klüppel were studied. The strengths of each method were identified and incorporated into a consolidated model that is more comprehensive and proficient than any single, existing, physics-based approach. In the present work, the friction coefficient was estimated for a summer tire tread compound sliding on sandpaper. The inputs to the model were the fractal properties of the rough surface and the dynamic viscoelastic modulus of rubber. The sandpaper-surface profile was measured accurately using an optical profilometer. Two-dimensional parameterization was performed using one-dimensional profile measurements. The tire tread compound was characterized via dynamic mechanical analysis. To validate the friction model, a laboratory-based, rubber-friction test that could measure the friction between a rubber sample and any arbitrary rough surface was designed and built. The apparatus consisted of a turntable, which can have the surface characteristics of choice, and a rubber wheel in contact with the turntable. The wheel speed, as well as the turntable speed, could be controlled precisely to generate the arbitrary values of longitudinal slip at which the dynamic coefficient of friction was measured. The correlation between the simulation and the experimental results was investigated.

MECHANICAL ANALYSIS OF THE ADAPTATIVE HIP GUIDE FOR PERIACETABULAR OSTEOTOMY SURGERY

2017 ◽  
Author(s):  
Flavia Bastos ◽  
ALEXANDRE SCARI ◽  
BRUNO GONCALVES SCHRODER e SOUZA ◽  
Fabiane Grazielle Silva
Keyword(s):  
Periacetabular Osteotomy ◽  
Mechanical Analysis

Characterization of hollow glass sphere reinforced epoxy composites: Dynamical mechanical analysis and morphology

2017 ◽  
Vol 59 (3) ◽  
pp. 239-243 ◽  
Author(s):  
Mihrigül Altan ◽  
Yusuf Kahraman ◽  
Beril Gümüş
Keyword(s):  
Mechanical Analysis ◽  
Glass Sphere ◽  
Epoxy Composites ◽  
Dynamical Mechanical Analysis ◽  
Hollow Glass ◽  
Hollow Glass Sphere

Movement Analysis of Philippine Folk Dance Itik-itik

2019 ◽  
Vol 2 (1) ◽  
pp. 56-63
Author(s):  
Pangilinan Math C ◽  
Fontanilla Lyndo V ◽  
Pineda Israel C ◽  
Rocelle E Agtang ◽  
Soriano Ria M ◽  
...  
Keyword(s):  
Movement Analysis ◽  
Adductor Muscle ◽  
Mechanical Analysis ◽  
Muscle Group ◽  
Upper Body ◽  
Folk Dance ◽  
Dance Movement ◽  
Dance Teacher ◽  
Hip Muscle ◽  
Dance Movements

The purpose of the study was to describe and analyze the dance movements of the Philippine folk dance Itik-itik. The researchers adopted the movement analysis method similar to that of Mackenzie that involves the (1) description of the actual movements which occur at the joints involved; (2) the plane in which the movement occurs; and (3) the muscles producing the movement (agonist & antagonist). In addition, similar to the study of Martin and Miller, the researchers also had done a mechanical analysis on the lever type involved in the execution of the dance movement in terms of force, axis, and resistance. Results revealed that the prominent dance steps in the Philippine local dance Itik-itik are the (1) running, (2) cross step, slide close, slide close step, (3) heel, close-ball, close arm, (4) step, slide-close, slide, (5) arms extension/flexion, and (6) flapping of the arms. The joints involved are the shoulder and hip muscle which are ball and socket type of joints; and elbow, knee and ankle which are hinge joints. The major muscles involved in the dance for the lower body include the quadriceps, hamstring muscle group, adductor muscle group, calves and gluts. While for the upper body muscles involved are the pectoralis major, latissimus dorsi, deltoid, trapezius, biceps, and triceps muscles. The type of lever used in performing the dance comprise majority of 1st class and 3rd class levers. By knowing the muscles involved in the dance the dance teacher may be able to devise activities to gradually prepare the prime mover muscles before the actual execution for injury prevention. Thus, the movements in the dance may improve the health and skill related fitness of the performers.

Movement Analysis of Philippine Folk Dance Tinikling

2019 ◽  
Vol 2 (1) ◽  
pp. 30-34
Author(s):  
Sanchez Jorielle C ◽  
Manlutac Crisalyn T ◽  
Salas Joven V ◽  
Soriano Marilou R ◽  
Santos Michael E ◽  
...  
Keyword(s):  
Movement Analysis ◽  
Adductor Muscle ◽  
Mechanical Analysis ◽  
The Philippines ◽  
Folk Dance ◽  
Dance Movement ◽  
Cardiovascular Endurance ◽  
Hip Muscle ◽  
Health Related ◽  
Muscle Groups

The purpose of the study was to describe the dance movements of the folk dance Tinikling which is the most popular traditional dance and former national dance of the Philippines.  The researchers adopted the movement analysis method similar to that of Mackenzie that involves the (1) description of the actual movements which occur at the joints involved; (2) the plane in which the movement occurs; and (3) the muscles producing the movement (agonist & antagonist). In addition, the researchers also had done a mechanical analysis on the lever type involved in the execution of the dance movement in terms of force, axis, and resistance. The prominent dance steps in the Philippine local dance Tinikling are the (1) running, (2) tinikling steps, (3) diagonal step, and (4) straddle jump with a turn step. The joints involved are: hip muscle which is ball and socket type of joint; and knee and ankle which are hinge joints. The major muscles involved in the dance include mostly the lower body muscle groups such as the quadriceps, hamstring, gluts, adductor muscle group, and calves. The type of lever used in performing the dance comprise majority of 1st, 2nd and 3rd class levers. Thus, the Tinikling is a viable dance which could improve the health related fitness of the performers in terms of muscular strength, muscular endurance, cardiovascular endurance and flexibility. Also, the dance could improve skill-related fitness such as power, agility, balance and coordination.

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