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In rock mechanics, several methods to define brittle rock materials were as follows.
First, the rock materials damaged when it reached or exceeded lightly the yield strength.
Thirdly, the materials fractured with little or no plastic flow.
It was hard to describe exactly the brittle failure process of rock materials.
The brittleness is not only deformation characteristics but also materials characteristics.

Journal of Materials Science (2007), 42 (9), pp 3033-3043
Xu :The future resources for eco-building materials: II.
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The Azo Journal of Materials Online - AZojomo (ISSN 1833-122X) - (2006), vol. 2

Hocine, et al., Improved efficiency of multicrystalline silicon solar cells by TiO2 antireflection coatings derived by APCVD process, Materials Science in Semiconductor Processing, 16 (2013)113-117
Liu, et al., Photocatalysis property of titania-based thin films with covalent grafting PANi as sensitizer, Advanced Materials Research, 549 (2012) 470-473
Fazlinashatul, et al., Solvent effects on the electrical and optical properties of nanocomposited MEH-PPV:TiO 2 films for organic solar cells application, Advanced Materials Research, 364 (2012) 86-89
Zhang, et al., Effects of substrate temperature on the structural and electrical properties of Cu(In,Ga)Se2 thin films, Solar Energy Materials and Solar Cells, 93 (2009) 114-118
Petrov, et al., Microstructural evolution during film growth, Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, 21( 2003) S117-S128.

Gilman: Journal of Applied Polymer Science Vol. 87 (2003), p.1329-1338
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Introduction Titanium alloys are known as difficult-to-machine materials, especially at dry machining, due to their several inherent properties[1-3].
At lastly, metals which are more adhesive tend to exhibit more ductility at elevated temperatures, thereby leading to possible cold-welding between the abrasive grits and workpiece materials.
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Axinte: Journal of Materials Processing Technology Vol.166, (2005), p.398

At room temperature, PMMA is a hard, fairly rigid material.
Dyes are large and important groups of chemicals which on binding with material will give colour to the material.
This sensitivity has led to their widespread application as sensitive fluorescent probes of a wide range of systems, including homogeneous solvents and mixtures as well as heterogeneous materials.
Halliwell, “WEATHERING OF PLASTICS GLAZING MATERIALS”, PhD.
R.Salim., “ Fourier transform infrared spectroscopy for irradiation coumarin doped polystyrene polymer films by alpha ray” , Journal of Radiation Research and Applied Sciences, 9(3) , (2016): 321-331

It is found that to improve stiffness, changing the geometry has a higher effect than materials selection [2].
Meireles, , Determination of material/geometry of the section most adequate for a static loaded beam subjected to a combination of bending and torsion , Materials Science Forum 730-732 (2013) 507-512 [2] H.M.
Wadley, The topological design of multifunctional cellular metals, Progress in Materials Science 46 (2001) 309-327
Hutchinson, Preliminary assessment of sandwich plated subject to blast loads, International Journal of mechanical sciences 45 (4) ( 2003) 687-705
Vautrin, Nonlinear interaction of geometrical and material properties in sandwich beam instabilities, International Journal of Solids and Structures 39 (2002) 3717-3739.

Fig. 4 represents the erosion rate of the two tested materials as a function of exposure time.
The erosion rate behavior of the two materials is somewhat similar to each other.
Martin, Cavitation erosion of materials, Int.
Cheng, Cavitation erosion and damage mechanisms of alloys with duplex structures, Materials Science and Engineering A242 (1998) 108–120
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The materials from which the solar simulator is made are critical in producing solar radiance and temperature that is more likely ideal for the Sun.
Aside from the aluminum flat solar absorber, use other materials as a solar absorber with high conductivity.
A large amount of heat energy can be acquired and tested by different materials suitable for the solar absorber.
Thermal Characteristic of Novel Insulation Materials Designed for Solar Simulator.
In International Conference and Exhibition on Sustainable Energy and Advanced Materials (pp. 230-235).

Dental materials such as teeth, or artificial dental materials are subjected to cyclic loading, varying temperature and varying corrosive agent [7].
, Dental Materials, 31 (2015), e247–77 [DOI: 10.1016/j.dental.2015.09.001]
Patnaik, et al., ‘Investigation of Wear Behavior of Nanoalumina and Marble Dust-Reinforced Dental Composites’, Science and Engineering of Composite Materials, 26 (2019), 84–96 [DOI: 10.1515/secm-2017-0152]
Test method for Knoop and Vickers hardness of materials.
Zaytsev, ‘Mechanical Properties of Human Enamel Under Compression: On the Feature of Calculations’, Materials Science and Engineering.