ベントナイトゲルの粘弾性とすべり破壊

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The hydrogel of Wyoming bentonite shows characteristic slip patterns under critical stress σ_0, i.e. the shear strength for slip fracture. The shear strength of the bentonite gels is related to the shear modulus G, as shown by the Eq. (1). G varies depending upon the concentration, and the proportional constant γ_0 takes values ranging from 1/10 to 1/30, which depend on the strain rate. In this report, the dependence of σ_0, G, γ_0 and viscosity η on the temperature and the relation between σ_0 and η were observed by the cone and plate method. The experimental results in Table I show the dependence of viscoelastic properties of bentonite gels on the concentration at 25℃. Over the wide range of concentration examined, a linear relation (2) is obtained between σ_0 and η, as shown in Fig. 1. A proportional constant R in this equation is approximately equal to 5×10^<-5> sec^<-1>, which is the lower critical rate of strain for the slip fracture. These facts suggest that γ_0 is proportional to η/G decrease with the increasing temperature between 3〜50℃, but take almost values at the temperature between 50〜70℃, as shown in fig. 2. Fig. 3 shows the facts that η and η/G decrease with the increasing temperature between 3〜70℃. Over the whole range of temperature examined the linear relation (1) holds between σ_0 and G, and then γ_0 is independent of temperature, as shown in Fig.4 and Table II.
社団法人日本材料学会の論文
1968-04-15

ベントナイトゲルの粘弾性とすべり破壊

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