Experimental study on three-point-bending characteristics of hard and soft rock-like materials under different loading rates

Huang, Da; Liu, Yang; Yang, Yunyun; Li, Zhao; Meng, Qiujie

doi:10.1007/s12517-021-08284-9

Cited by 4 publications

(1 citation statement)

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“…The 4PB-DIC-LP tests have reached a lower peak load (−28%) but higher deflection (+92% read by transducers and +56% read by DIC) than 4PB-LP, which were carried out with a speed 10 times faster. As reported in [ 39 ], from experimental results, the peak load decreases as the loading rate decreases, while the displacement increases.…”

Section: Methodssupporting

confidence: 65%

A Bi-Modulus Material Model for Bending Test on NHL3.5 Lime Mortar

2023

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The research provides an innovative contribution to the interpretation of three-point and four-point bending tests on mortars by employing a bi-modulus material model, which assumes an asymmetric constitutive law, i.e., different elastic moduli in tension and in compression. To this aim, Euler–Bernoulli and Timoshenko bi-modulus beam models are defined, and the related displacement fields are reported for three-point loading, and provided for the first time for the four-point bending layout. A wide experimental campaign, including uni-axial tensile and compressive tests, three-point and four-point bending tests, and on notched specimens three-point tests for mode-I fracture energy, has been carried out on lime mortar specimens exploiting traditional contact (CE-DT) and contactless (DIC) measurement systems. Experimental results provided the values of tensile and compressive mechanical characteristics, which are employed to validate estimations of the analytical model. The tension-to-compression moduli ratio experimentally observed is on average 0.52. Experimental outcomes of the DIC analysis proved the bi-modulus behaviour during the four-point bending tests showing visible shifting of the neutral axis. The bi-modulus analytical model provides closer results to the experimental ones for the slender specimens subjected to four-point bending.

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Section: Methodssupporting

confidence: 65%