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Lemaitre, Journal of Engineering Materials and Technology 107, 83 (1985)
Gurson, Journal of Engineering Materials and Technology 99, 2 (1977)
Hill, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 193, 281 (1948)
Barlat, International Journal of Plasticity 22, 1171 (2006)
Habraken, Materials Science and Engineering: A 605, 39 (2014)

Fig. 1: Poisson’s ratio η is defined as the ratio of contraction to extension and expresses the elastic deformation of a material [7] The value of the Poisson’s ratio is usually 0 - 0.5 (the value may also be negative for some “auxetic” materials [7]).
The determination of the PR value of cementitious materials can be carried out by for example the resonance method [8], but only in the case of hardened composites after reaching the demoulding compressive strength.
Its value will gradually decrease to a value close to 0.2, which is given for hardened cementitious materials.
Hela, Selected Technological Factors Influencing the Modulus of Elasticity of Concrete, International Journal. of Civil and Environmental.
Lakes, Negative-Poisson's-Ratio Materials: Auxetic Solids, Annual Review of Materials Research. 47 (2017) 63 - 81 [8] ČSN 73 1372.

However, the process for preparation sodium ascorbate mentioned above has some defects such as long reaction cycle, low conversion rate, high cost of raw materials and poor quality of crude sodium ascorbate product.
Experimental procedures At first, put 130 gram 2KLG and 1000 milliliter methanol into a clean four-mouth flask, then add 5 gram concentrated sulfuric acid and mix the materials.
In addition, the use of sodium carbonate reduces the cost of materials and has good potential applications.
Yi: Journal of Biological EngineeringVol. 2, Iss.4 (1986) , p. 17-21.
Yang, etc.: Journal of Hebei University of Science and Technology Vol. 32, Iss.3 (2011) , p. 281-284.

Liu et al. synthesized LSGM electrolyte materials prepared by glycine-nitrate process, and the conductivity of the materials was 0.02S/cm in the air below 850oC [7].
At present, LSGM is widely applied as electrolyte materials of SOFC.
Results and Discussion Preparation process of LSGM electrolyte materials.
Ma: Journal of Rare Earths, Vol.24(2006), p.98-103
Dai: Chinese Journal of Rare Metals, Vol.31(2007), p.86-91

Focusing on the characteristic of hard-to-grinding for viscous materials, such as titanium alloy, systemic process experiments were done about grinding viscous materials, such as TC4 titanium alloy, under the high efficiency deep grinding (HEDG).
These affect on grinding precision, material removal rates and surface integrity of workpieces and limit large quantity application of these materials.
Shi: Grinding of Difficult-to-cut Materials (National Defense Industry Press, China 1999).
Machining Characteristics and Surface Integrity of Yttria Stabilized Tetragonal Zirconia in High Speed Deep Grinding, Materials Science and Engineering A345 (2003) 155-163 [15] H.
Machining Science and Technology.

It has been shown that apart from one-component fuel, it is also advisable to use mixtures composed of basic raw materials.
Materials and methodology Various samples of pellets from pure materials - sawdust, straw and hay - were produced to determine the burning heat and calorific value.
Balog: European Journal of Environmental and Safety Sciences Vol. 1 (2013), p. 24-31
Jiang: European Journal of Environmental and Safety Sciences Vol. 1 (2013), p. 1-7
Puskajler: European Journal of Environmental and Safety Sciences Vol. 2 (2014), in press

Regulation of Rheological Properties of Three-Phase Dispersed Systems Used for the Production of Building Materials Vladimir V.
Introduction Raw mixtures used in the production of many building materials are structured dispersed systems that belong to the class of elastic-visco-plastic materials.
Korvyakov / / Bulletin of the Department of Construction Sciences of the Russian Academy of Sciences, Vol. 3, 2000. 109-114
Autogate bulk materials.
Comparisons of Hamaker constants for ceramic systems with intervening vacuum or water: From force laws and physical properties //Journal of Colloid and Interface Science. (1996) Vol. 179. no. 2. 460-469

Suganuma: Current Opinion in Solid State and Materials Science vol. 5 (2001), p. 55-64
MANNAN: Journal of ELECTRONIC MATERIALS vol. 31 (2002), p. 879-886
MUTOH: Journal of ELECTRONIC MATERIALS vol. 31 (2002), p. 456-465
Otsuka: Journal of Electronic Materials vol. 27 (1998), p. 1229-1235
SHANG: Journal of ELECTRONIC MATERIALS vol. 34 (2005), p. 62.

Characteristics of welded materials are described.
Preparation of welded materials is outlined.
The parameters of materials used are given in Table 1.
Acarer: Materials Science and Engineering A363 (2003) p. 290 [4] S.
Al-Hassami: Journal of materials processing technology 202 (2008) p. 224

Research on Adaptability of Slag-based Geopolymer with Superplasticizer Qing Wang 1,2 a, Lin Li2,b , Chang-Peng Wu2,c and Zhi-Tong Sui1,d 1 School of Materials & Metallurgy, Northeastern University, Shenyang, China 2 School of Materials Science and Engineering, Shenyang Jian Zhu University, Shenyang, China a mail: wangqingmxy@126.com, bmail: ll86268555@163.com, cmail: wuchangpeng1981@163.com, d mail: suizt3583@163.com Keywords: slag-based geopolymer; superplasticizers; adaptablity; fluidity Abstract.
Using slag and metakaoline as raw materials , different modules of water glass as activator ,a new type of cementitious material-slag-based geopolymer was prepared.
Using slag and metakaoline as raw materials , different modules of water glass was used as activator in the paper ,a new type of cementitious materials-slag-based geopolymer was prepared.
:Geopolymers and geopolymeric materials.Therm.Anal, 1989,35(2) ,429-441
:Geopolymers: inorganic polymeric new materials.Journal of Thermal Analysis, 1991,37: 1633-1656