scholarly journals Development of an indentation method for material surface mechanical properties measurement

2005 ◽  
Author(s):  
Ziheng Yao
Keyword(s):  
Mechanical Properties ◽  
Material Surface ◽  
Indentation Method

Application of Microbial Polyesters-Polyhydroxyalkanoates as Tissue Engineering Materials

2005 ◽  
Vol 288-289 ◽  
pp. 437-440 ◽  
Author(s):  
Guo Qiang Chen ◽  
Qiong Wu ◽  
Ya Wu Wang ◽  
Zhong Zheng
Keyword(s):  
Mechanical Properties ◽  
Tissue Engineering ◽  
Surface Treatment ◽  
Surface Properties ◽  
Three Dimensional ◽  
Material Surface ◽  
New Class ◽  
Molecular Studies ◽  
Cartilage Cells ◽  
Engineering Materials

Poly(hydroxybutyrate-co-hydroxyhexanoate) (PHBHHx) has improved mechanical properties over the existing PHA and our results have shown that PHBHHx has better biocompatibility over polyhydroxybutyrate (PHB) and polylactic acid (PLA). Surface treatment with lipases dramatically changed the material surface properties and increased the biocompatibility of the PHBHHx. PHBHHx and its PHB blends had been used to make three dimensional structures and it has been found that cartilage, osteoblast, and fibroblasts all showed strong growth on the PHBHHx scaffolds. The growth was much better compared with PLA. The molecular studies also showed that mRNA encoding cartilages were strongly expressed when cartilage cells were grown on the PHBHHx. As PHBHHx has strong mechanical properties, easily processible and biodegradable, this material can be used to develop a new class of tissue engineering materials.

Evaluating Mechanical Properties of Cement Materials by Depth-Sensing Indentation Method

2010 ◽  
Vol 44-47 ◽  
pp. 2587-2591
Author(s):  
Xiu Fang Wang ◽  
Yi Wang Bao ◽  
Kun Ming Li ◽  
Yan Qiu ◽  
Xiao Gen Liu
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Energy Dissipation ◽  
Engineering Application ◽  
Calculated Data ◽  
Absorption Capacity ◽  
Cement Industry ◽  
Depth Sensing ◽  
Indentation Method ◽  
Recovery Resistance

The energy consumption of crushing is directly affected by the mechanical properties of cement materials. The elastic modulus, energy dissipation, recovery resistance and other mechanical properties of cement materials are evaluated based on the depth-sensing indentation method in this work. It is significant and efficient for engineering application. In results, the calculated elastic modulus is close to that measured by dynamic method, being used to verify the correctness of the calculated data. And the calculated energy dissipation of clinker is higher than that of limestone and granite, which can partially be used to explain why the grinding of clinker consumes a lot of energy in cement industry. The recovery resistance of clinker is almost identical to that of granite, more than that of limestone. It is found that the clinker, in contrast to granite and limestone, exhibits better plasticity and greater energy absorption capacity.

scholarly journals Influence of HIP Treatment on Mechanical Properties of Ti6Al4V Scaffolds Prepared by L-PBF Process

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1267 ◽  
Author(s):  
Lili Liu ◽  
Huade Zheng ◽  
Chunlin Deng
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Oxide Layer ◽  
Critical Stress ◽  
Porous Scaffold ◽  
Optical Microscope ◽  
Post Treatment ◽  
Material Surface ◽  
Porous Scaffolds ◽  
Pressure Test

To improve biocompatibility and mechanical compatibility, post-treatment is necessary for porous scaffolds of bone tissue engineering. Hot isostatic pressing (HIP) is introduced into post-treatment of metal implants to enhance their mechanical properties by eliminating residual stress and pores. Additionally, oxide film formed on the material surface can be contributed to improve its biocompatibility. Ti6Al4V porous scaffolds fabricated by laser-powder bed fusion (L-PBF) process is studied in this paper, their mechanical properties are measured by pressure test, and the macroscopic surface morphology and microstructure are observed by optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). After HIP treatment, an oxide layer of 0.8 μm thickness forms on the surface of Ti6Al4V porous scaffolds and the microstructure of Ti6Al4V transforms from α’ phase to α + β dual-phase, as expected. However, the pressure test results of Ti6Al4V porous scaffolds show a definitely different variation trend of mechanical properties from solid parts, unexpectedly. Concerning Ti6Al4V porous scaffolds, the compression stiffness and critical stress improves clearly using HIP treatment, and the fracture morphology shows obvious brittle fracture. Both the strengthening and brittleness transition of Ti6Al4V porous scaffolds result from the formation of an oxide layer and an oxygen atom diffusion layer. The critical stress of Ti6Al4V porous scaffolds can be calculated by fully considering these two strengthening layers. To obtain a porous scaffold with specific mechanical properties, the effect of post-treatment should be considered during structural design.

scholarly journals Kekerasan Baja Karbon Sedang dengan Variasi Suhu Permukaan Material

Jurnal METTEK ◽  
2018 ◽  
Vol 4 (2) ◽  
pp. 43
Author(s):  
Dwi Payana ◽  
I Made Widiyarta ◽  
Made Sucipta
Keyword(s):  
Mechanical Properties ◽  
Carbon Steel ◽  
Contact Surface ◽  
Room Temperature ◽  
Failure Mechanisms ◽  
Material Surface ◽  
Temperature Variations ◽  
Vickers Indent ◽  
Steel Material ◽  
Hardness Tests

Beban gesek pada permukaan sebuah benda dapat menimbulkan panas pada permukaan kontak benda tersebut. Semakin besar beban gesek yang terjadi, suhu pada permukaan material akan menjadi lebih tinggi. Peningkatan suhu permukaan yang semakin tinggi dapat mempengaruhi sifat mekanis permukaan material dan tentunya dapat berimplikasi terhadap mekanisme kegagalan pada permukaan material tersebut, seperti kegagalan aus dan kegagalan retak. Pada penelitian ini, uji kekerasan dilakukan pada material dengan suhu permukaan tertentu. Permukaan material baja karbon sedang dipanaskan dengan variasi suhu yaitu mulai dari suhu kamar sampai dengan 300ºC, kemudian dilakukan uji Vicker’s. Tingkat kekerasan dan profil indentasi Vickers pada permukaan material dengan variasi suhu tersebut kemudian diinvestigasi. Friction load on the surface of an object can cause heat on the contact surface of the object. The larger the frictional load occurs, the temperature on the surface of the material will become higher. Increased surface temperatures can further affect the mechanical properties of the material surface and can certainly have implications for the failure mechanisms on the surface of the material, such as wear failure and crack failure. In this study, hardness tests were performed on materials with certain surface temperature. The surface of the carbon steel material is being heated with temperature variations ranging from room temperature up to 300ºC, then Vicker's test. The degree of hardness and Vickers indent profile on the surface of the material with the temperature variation is then investigated.

Indentation Induced Deformation and Crack Behavior of β-SiC Irradiated at High Temperature

2005 ◽  
Vol 287 ◽  
pp. 489-494
Author(s):  
Kyeon Hwan Park ◽  
Tatsuya Hinoki ◽  
Akira Kohyama
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Physical And Mechanical Properties ◽  
Radiation Hardening ◽  
Irradiation Damage ◽  
Indentation Method ◽  
Microstructural Observation ◽  
Crack Behavior ◽  
Complex Propagation ◽  
Property Changes

Irradiation damage produced by neutrons or energetic particles lead to changes of physical- and mechanical-properties of SiC. Radiation hardening and fracture toughness changing of SiC were clarified by indentation method previously. However, the mechanism studies have received little alteration. The purpose of this study is to improve the understanding of the mechanisms of mechanical property changes under irradiation. In this paper, the microstructural observation beneath and near an indentation will be used to infer mechanisms of radiation hardening and toughening. Indenting polycrystalline SiC creates deformation and cracking in the plastically deformed region. In the case of irradiated SiC, however, small-sized deformation zone was observed below contact indent, which resulted in the restricted size of residual impression. Additionally, the indentation cracks showed complex propagation behaviors such as deflecting, branching and microcracking.

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