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<p>This paper performed the direct shear test for a green sand mold to construct the Mohr–Coulomb (MC) model as a mechanical model of the green sand mold, which is essential to predict the casting deformation by computer simulation. It is generally known that the pressure loaded on the test piece is not fully transmitted to its shear plane in the direct shear test because of the friction between the test piece and the shear box. A previous study estimated the vertical stress on the shear plane from the pressure transmission coefficient measured when the test piece was not sheared. However, this method ignored the change in the value and direction of the wall friction due to the dilatancy of the test piece during shearing. The present paper determines the values of the material constants in the MC model by two methods: by eliminating the effect of the wall friction during shearing and by ignoring that effect. In the prior method, the vertical stress on the shear plane is directly measured throughout the test by the load cell attached below the test piece. As a result, when the wall friction effect during shearing is not eliminated, the strength of the test piece was evaluated to be twice as large as that obtained eliminating the wall friction effect. With the MC model ignoring the wall friction, the computer simulation to predict the casting deformation will estimate the unrealistically high strength of the mold, leading to an erroneous prediction of the casting deformation.</p>

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Experimental Construction of Mohr–Coulomb Model for Green Sand Mold by Direct Shear Test Eliminating Effect of Wall Friction

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月13日

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  • Yasuhiko Okimura,
  • Takumi Kumaki,
  • Hideki Yoshida,
  • Kohei Nishi,
  • Noriyuki Kato,
  • Koji Tokunaga,
  • Kunihiro Hashimoto,
  • Makoto Matsuura,
  • Sadatoshi Koroyasu,
  • Hideo Komine,
  • Yasuhiro Maeda,
  • Toshimitsu Okane,
  • Tomoyuki Miyashita,
  • Makoto Yoshida

摘要

This paper performed the direct shear test for a green sand mold to construct the Mohr–Coulomb (MC) model as a mechanical model of the green sand mold, which is essential to predict the casting deformation by computer simulation. It is generally known that the pressure loaded on the test piece is not fully transmitted to its shear plane in the direct shear test because of the friction between the test piece and the shear box. A previous study estimated the vertical stress on the shear plane from the pressure transmission coefficient measured when the test piece was not sheared. However, this method ignored the change in the value and direction of the wall friction due to the dilatancy of the test piece during shearing. The present paper determines the values of the material constants in the MC model by two methods: by eliminating the effect of the wall friction during shearing and by ignoring that effect. In the prior method, the vertical stress on the shear plane is directly measured throughout the test by the load cell attached below the test piece. As a result, when the wall friction effect during shearing is not eliminated, the strength of the test piece was evaluated to be twice as large as that obtained eliminating the wall friction effect. With the MC model ignoring the wall friction, the computer simulation to predict the casting deformation will estimate the unrealistically high strength of the mold, leading to an erroneous prediction of the casting deformation.