A small punch test technique for characterizing the elastic modulus and fracture behavior of PMMA bone cement used in total joint replacement

Abstract Miniature specimen testing techniques are necessary to characterize the mechanical behavior of UHMWPE components for total joint replacement after sterilization, shelf aging, and implantation. The small punch test has been shown to reproducibly characterize virgin and in vitro aged UHMWPE. The first goal of this study was to demonstrate the feasibility of applying this technology to UHMWPE components after retrieval from the human body. Six short-term retrievals of the same tibial design were characterized with the intent of comparing the mechanical behavior of conventional and enhanced UHMWPE having an extended chain crystalline morphology. Statistically significant relationships were observed between damage scores and the small punch test metrics of initial load, ultimate load, and work to failure. The results of this study support the hypothesis that the in vivo performance of tibial bearings is related to the large deformation mechanical behavior of UHMWPE.

Download Full-text

Determination and Validation of Gurson-Tvergaard Model Parameters for Finite Element Simulation of Small Punch Test

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.750.59 ◽

2015 ◽

Vol 750 ◽

pp. 59-68 ◽

Cited By ~ 2

Author(s):

Yan Yan Lu ◽

Liang Chen ◽

Kai Shu Guan

Keyword(s):

Finite Element ◽

Finite Element Simulation ◽

Model Parameters ◽

Displacement Curve ◽

Small Punch Test ◽

Test Technique ◽

Small Punch ◽

Punch Test ◽

Element Simulation ◽

Load Displacement

Small punch test (SPT) is a miniature sample test technique which can evaluate in-service material properties with an almost non-destructive method. Since the deformation behavior of the small punch specimen is complicated, finite element simulation embedded with Gurson-Tvergaard (GTN) model is adopted to simulate elastic-plastic behaviour until fracture. Choosing the proper GTN parameters is crucial for the small punch simulation, which directly influence the precision of load-displacement curve obtained from simulation. In this paper, load-displacement curve is divided into five stages and the parameters identification process is done by adjusting the simulation curve with experimental load-displacement curve in different stages which controlled by separately parameters. The results show that the parameters determined based on this criterion are not unique. In order to validate the reliability of this method, specimen’s minimum thickness of cross-section after fracture was introduced as an extra criterion which turned out to be feasible. Load-displacement curves cannot serve as the only criterion to verify the GTN parameters.

Download Full-text

Interlaboratory Study for Small Punch Testing Preliminary Results

Volume 1A: Codes and Standards ◽

10.1115/pvp2018-84142 ◽

2018 ◽

Author(s):

Milan Brumovsky ◽

Radim Kopriva

Keyword(s):

Nuclear Power ◽

Structural Materials ◽

Lessons Learned ◽

Interlaboratory Study ◽

Current Status ◽

Small Punch Test ◽

Test Procedures ◽

Test Technique ◽

Small Punch ◽

Punch Test

Small punch test specimens are widely used for a long time as they are simple to produce and requires only a small volume of material. This fact is advantageous especially for high activity materials but also for assessment of operational damage in components materials when component integrity and strength may not be affected. In the same time, no test standard exists and several different specimen types and test procedures have been developed in different place. Thus, to unify this activity, considerable attention has been paid since 2012 to the standardization of small punch test technique within the American Society of Testing and Materials (ASTM). In 2016 a large InterLaboratory Study has been launched within the ASTM subcommittee E10.02 - Behavior and Use of Nuclear Structural Materials, involving 12 laboratories and 6 evaluated structural materials from the nuclear and non-nuclear power plant components. Paper describes the current status of ASTM standardization, results of the InterLaboratory Study, first analysis of the results with respect to some important test parameters, lessons learned and open questions remaining to be solved for the successful completion of the standardization process.

Download Full-text

Characterization of Fracture Behavior in Small Punch Test by Combined Recrystallization-Etch Method and Rigid Plastic Analysis

Journal of Testing and Evaluation ◽

10.1520/jte11549j ◽

1987 ◽

Vol 15 (1) ◽

pp. 30 ◽

Cited By ~ 105

Author(s):

A Wolfenden ◽

X Mao ◽

T Shoji ◽

H Takahashi

Keyword(s):

Fracture Behavior ◽

Small Punch Test ◽

Rigid Plastic ◽

Small Punch ◽

Punch Test ◽

Plastic Analysis

Download Full-text

High Temperature Deformation and Fracture Behavior in Sintered Mo/PSZ Composites as Evaluated by Small Punch Test

Journal of the Japan Institute of Metals and Materials ◽

10.2320/jinstmet1952.59.10_1055 ◽

1995 ◽

Vol 59 (10) ◽

pp. 1055-1060 ◽

Cited By ~ 8

Author(s):

Wan Jiang ◽

Jing-feng Li ◽

Akira Kawasaki ◽

Ryuzo Watanabe

Keyword(s):

High Temperature ◽

Fracture Behavior ◽

High Temperature Deformation ◽

Temperature Deformation ◽

Small Punch Test ◽

Small Punch ◽

Punch Test ◽

Deformation And Fracture

Download Full-text

Influence of the Microstructure on the Fracture Behavior of Carbon Bonded Alumina

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.592-593.279 ◽

2013 ◽

Vol 592-593 ◽

pp. 279-282 ◽

Cited By ~ 1

Author(s):

Stefan Soltysiak ◽

Martin Abendroth ◽

Meinhard Kuna ◽

Steffen Dudczig

Keyword(s):

Electron Microscopy ◽

Mechanical Properties ◽

Scanning Electron Microscopy ◽

Fracture Behavior ◽

Small Punch Test ◽

Open Cell ◽

Small Punch ◽

Punch Test ◽

Different Types ◽

Scanning Electron

Carbon bonded alumina (Al2O3-C) in various compositions are developed for the production of open cell filters, which are used for melt metal filtration processes [. The Small Punch Test (SPT) is used to determine the mechanical properties of such materials. Previous investigations showed two different types of fracture behavior [2,, which can be distinguished by typical features of the load deflection curves of the SPT. This paper clarifies this behavior by examining the fracture surfaces using scanning electron microscopy (SEM).

Download Full-text