Scratch behavior of polycarbonate by Rockwell C diamond indenter under progressive loading

2020 ◽  
Vol 90 ◽  
pp. 106643
Author(s):  
Ming Liu ◽  
Shenghan Yang ◽  
Chenghui Gao
Keyword(s):  
Diamond Indenter ◽  
Progressive Loading ◽  
Scratch Behavior

scholarly journals Stairway to memory: left-hemispheric alpha dynamics index the progressive loading of items into a short-term store

NeuroImage ◽  
2021 ◽  
pp. 118024
Author(s):  
Alex I. Wiesman ◽  
Nicholas J. Christopher-Hayes ◽  
Tony W. Wilson
Keyword(s):  
Short Term ◽  
Progressive Loading

Effect of Mold Temperature and Additive Migration on Scratch Behavior of TPOs at Elevated Temperatures

Polymer ◽  
2021 ◽  
pp. 123709
Author(s):  
Kwanghae Noh ◽  
Jason Fincher ◽  
Robert Mimms ◽  
Hung-Jue Sue
Keyword(s):  
Elevated Temperatures ◽  
Mold Temperature ◽  
Scratch Behavior

Effect of filler content on scratch behavior and tribological performance of polyester/graphene oxide nanocomposite coating

2021 ◽  
Author(s):  
Nedia Gafsi ◽  
Raquel Verdejo ◽  
Mohamed Kharrat ◽  
Massimiliano Barletta ◽  
Miguel Ángel López-Manchado ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Filler Content ◽  
Nanocomposite Coating ◽  
Tribological Performance ◽  
Scratch Behavior

A Study of the Mechanical Role of Enamel and Dentin in Human Teeth

2012 ◽  
Author(s):  
Keyoung Jin Chun ◽  
Hyun Ho Choi ◽  
Jong Yeop Lee
Keyword(s):  
Surface Hardness ◽  
Mechanical Tests ◽  
Indentation Load ◽  
Bite Force ◽  
Compression Tests ◽  
Healthy Human ◽  
Human Teeth ◽  
Diamond Indenter ◽  
Dental Hard Tissues ◽  
Measured Hardness

The dental hard tissues of a tooth are combined of enamel and dentin together. The enamel protects the dentin and comes in direct contact with food during mastication. Bite force is expressed as compression force. The purpose of this study is to identify the primary roles of enamel and dentin during mastication by analyzing their mechanical properties and hardness. Healthy human teeth (age: 19.3 ± 4.1) were used as specimens for mechanical tests. The teeth, which underwent epoxy resin molding, were machine cut to make 10 enamel specimens, 10 dentin specimens and 10 enamel–dentin composite (ED) specimens of 1.2 mm × 1.2 mm × 3.0 mm (Width × Height × Length) in size. Compression tests were conducted using a micro-load system at 0.1 mm/min test speed. Teeth surface hardness (HV) was measured by a Vickers diamond indenter with a 300g indentation load. Data were obtained from 4 points on each enamel specimen and 4 points on each dentin specimen. The strain (%), stress (MPa) and modulus of elasticity (E, MPa) of the specimens were obtained from compression tests. The MAX. strain of the enamel, dentin and ED specimens were 4.5 ± 0.8 %, 11.9 ± 0.1 % and 8.7 ± 2.7 %, respectively. The MAX. stress of the enamel, dentin and ED specimens were 62.2 ± 23.8 MPa, 193.7 ± 30.6 MPa and 126.1 ± 54.6 MPa, respectively. The E values of the enamel, dentin and ED specimens were 1338.2 ± 307.9 MPa, 1653.7 ± 277.9 MPa and 1628.6 ± 482.7 MPa, respectively. The E of the dentin specimens was the highest and the E of the enamel specimens was the lowest, but the E values of all specimens was not significantly different in the T-test (P > 0.1). The measured hardness value of the enamel specimens (HV = 274.8 ± 18.1) was about 4.2 times higher than that of the dentin specimens (HV = 65.6 ± 3.9). Because of the values of MAX. stress and MAX. strain of the enamel specimens, the enamel specimens tended to fracture earlier than the dentin and ED specimens; therefore, enamel was considered to be more brittle than dentin and ED. Enamel is a harder tissue than dentin based on their measured hardness values. Therefore, enamel has a higher wear resistance, making it suitable for grinding and crushing, whereas dentin has a higher force function, making it suitable for abutment against bite force.

Scratch behavior and mechanical properties of alternating multi-layered PMMA/PC materials

Wear ◽  
2021 ◽  
pp. 204069
Author(s):  
Yang Xu ◽  
Jingxian Qin ◽  
Jiabin Shen ◽  
Shaoyun Guo ◽  
Khalid Lamnawar
Keyword(s):  
Mechanical Properties ◽  
Scratch Behavior

scholarly journals Scratch Behaviour of Silicon Solid Solution Strengthened Ferritic Compacted Graphite Iron (CGI)

2018 ◽  
Vol 925 ◽  
pp. 318-325
Author(s):  
Rohollah Ghasemi ◽  
Anders E.W. Jarfors
Keyword(s):  
Solid Solution ◽  
Normal Load ◽  
Scratch Test ◽  
Scratch Resistance ◽  
Compacted Graphite Iron ◽  
Depth Of Penetration ◽  
Scratch Depth ◽  
Compacted Graphite ◽  
Diamond Indenter ◽  
Different Content

The present study focuses on scratch behaviour of a conventional pearlitic and a number of solid solution strengthened ferritic Compacted Graphite Iron (CGI) alloys. This was done by employing a single-pass microscratch test using a sphero-conical diamond indenter under different constant normal loads conditions. Matrix solution hardening was made by alloying with different content of Si alloy; (3.66, 4.09 and 4.59 wt%. Si) which are named as low-Si, medium-Si and high-Si ferritic CGI alloys, respectively. A good correlation between the tensile and scratch test results was observed explaining the influence of CGI’s matrix characteristics on scratch behaviour both for pearlitic and fully ferritic solution strengthened ones. Both the scratch depth and scratch width showed strong tendency to increase with increasing the normal load, however the pearlitic one showed more profound deformation compared to the solution strengthened CGI alloys. Among the investigated alloys, the maximum and minimum scratch resistance was observed for high-Si ferritic CGI and pearlitic alloys, respectively. It was confirmed by the scratched surfaces analysed using Scanning Electron Microscopy (SEM) as well. In addition, the indenter’s depth of penetration value (scratch depth) was found as a suitable measure to ascertain the scratch resistance of CGI alloys.Keywords: Silicon solution strengthening, CGI, Abrasion, Scratch testing, Scratch resistance

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