Multiple Structural Changes Found around Crack Tip of Carbon Black-filled Natural Rubber Vulcanizate (original) (raw)

2019, NIPPON GOMU KYOKAISHI

Shear Stress Transfer of Roughened Concrete for Existing R/C Members and Mechanical Model Based on Contact Stress on Local Surface

Journal of Structural and Construction Engineering (Transactions of AIJ)

When buildings undergo seismic retrofitting, reinforcing members are connected to existing members by roughening the concrete surfaces and installing new anchors. In the Japanese guidelines pertaining to the seismic retrofitting of structures, no standards are provided for concrete roughening. Therefore, we conducted shear loading tests and measurements of the roughened surfaces were taken. Then, mechanical models of the roughened concrete surfaces were developed based on a constitutive law for cracked concrete surfaces. Using the results, a model is proposed from which shear stress-shear displacement relations as well as normal stress-shear displacement relations can be reasonably estimated.

Lecture Course of Soft Matter Physics for Rubber Engineers

NIPPON GOMU KYOKAISHI

Rubber industries utilize many kinds of soft matter, polymer, colloids, surfactants etc. They are complex materials, but they all obey the law of physics, and their complex behaviors can be understood in terms of physics. In this series of lectures, I will try to explain the principles of physics which governs the complex behavior of these materials. In this first chapter, I will discuss the elasticity of rubbers: where does the unique elasticity of rubber come from, and how to understand the strange behaviors of rubber balloons.

Proposal for Two-Dimensional Shear Transfer Model Considering Shear Stress Softening on Local Crack Surface

Journal of Structural and Construction Engineering (Transactions of AIJ)

The aim for this study is to clarify the shear stress transfer mechanism on the concrete crack surface. In the previous paper, it was confirmed that the stress softening was occurred on local crack surface by the authors experiments. However, the shear stress transfer models considering this phenomenon haven't been constructed. Therefore, it is needed to be proposed such a shear transfer model, and authors tried to do it. The proposal model is based on the contact theory in two-dimension. Moreover this model and other previous models are compared with the experimental curves in order to be verification of the models adaptation. In this paper, the formulations of the proposal model and results of comparing are presented. As the result, it is concluded that the proposal model can fit authors experimental results much better than any other previous models.

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