Essay Title: 

UHMWPE Fracture

March 21, 2016 | Author: | Posted in health and medicine, nutrition

Running Head : UHMWPE Fracture

UHMWPE Fracture (Author ‘s Name (Institution ‘s Name

S . No Table of Contents Page No

1 Fracture Mechanics : An Introduction 3

2 Linear Elastic Fracture Mechanics Principles 4

3 (UHMWPE : An Introduction 4

4 Experimental Methods 10

5 Small Punch Testing 11

6 Data Analysis 12

7 Results 13

8 Discussion Conclusions 16

9 Bibliography 20

10 Appendix 24

Fracture Mechanics : An Introduction

From examining fallen structures , engineers found that most collapse began with cracks . These cracks may be caused by [banner_entry_middle]

material defects discontinuities in assembly and /or design , harsh environments and damages in service . Most microscopic cracks are arrested inside the material however it takes one run-away crack to destroy the whole structure

To analyze the relationship among stresses , cracks , and fracture toughness , Fracture Mechanics was introduced . The first milestone was set by Griffith in his famous 1920 that quantitatively relates the flaw size to the fracture stresses . Nevertheless , Griffith ‘s method is too old for engineering applications and is only good for brittle materials

is defined as the rate of change in potential energy near the crack area for a linear elastic material was replaced by the stress intensity factor K with a similar approach by other researchers

Modern trends of fracture research include dynamic and time-dependent fracture on nonlinear materials , fracture mechanics of microstructures and models related to local , global , and geometry-dependent fractures

Linear Elastic Fracture Mechanics Principles

Linear elastic fracture mechanics (LEFM ) principles are used to relate the stress magnitude and distribution near the crack tip to

Remote stresses applied to the cracked component

The crack size and shape

The material properties of the cracked component

Linear elastic fracture mechanics (LEFM ) is based on the application of the theory of elasticity to bodies containing cracks or defects . The assumptions used in elasticity are also intrinsic in the theory of LEFM small displacements and general linearity between stresses and strains

Ultrahigh Molecular Weight Polyethylene (UHMWPE : An Introduction

One of the main experiments to extend the service life of replacements is reducing the volume of wear debris released from the articulating surface , with the goal of limiting particle-induced osteolysis (Kurtz et al ,

. 1659-1688 Muratoglu and Kurtz , 2002 . To address long-term osteolyis , highly crosslinked ultrahigh molecular weight polyethylene (UHMWPE ) materials have been developed . Even though the wear resistance of highly crosslinked UHMWPE observed in hip simulator studies (Kurtz et al ,

. 1659-1688 Muratoglu and Kurtz 2002 Muratoglu et al ,

. 77 Jasty et al ,

. 785 McKellop et al , 98 O ‘Connor et al , 816 , researchers have also observed that certain uniaxial mechanical properties decrease following crosslinking particularly the uniaxial elongation to failure (Muratoglu , Bragdon O ‘Connor , Jasty , Harris ,

. 77 Muratoglu O . K , Bragdon C . R , O ‘Connor D . O , Jasty M , Harris W . H , Gul R , McGarry ,

.1463-1470 . Radiation crosslinking has also been observed to decrease the static fracture and fatigue crack propagation resistance of UHMWPE (Eberhardt et al , 480 Krzypow and Rimnac ,

. 2081-2087 Baker et al , 573-581 Baker… [banner_entry_footer]

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