The University of Tokyo · Engineering
Professor Wenli Lin's research lab specializes in the micromechanical behavior of granular materials, with a focus on understanding particle-scale failure mechanisms through advanced acoustic emission (AE) monitoring and experimental triaxial testing. The lab investigates particle crushing, shear banding, and strain localization in sands—particularly coral and silica sands—under various stress and environmental conditions, integrating AE signal analysis with microstructural characterization. A key research direction involves developing 3D AE source location techniques and correlating high-frequency AE emissions with mechanical behavior to quantify failure progression in real time.
Figures are computed from collected data and may differ slightly.
Since the mechanical failure of granular soils is the macro-manifestation of complex internal particle interactions, studying this relevant issue from micro-scale perspective is of fundamental importance. Acoustic Emission (AE) has become a promising approach for this purpose; however, its synthetic and validating study on granular soils with various ground conditions is far from substantive. In an attempt to verify and correlate the relationship between AE behaviors and mechanical behaviors of
The acoustic emission (AE) technique can be used to locate failure-induced AE sources and provides an alternative to continuously visualise the development of failures inside stressed materials; however, a literature review reveals almost no studies regarding its application for source location in granular materials. Yet the visualisation of ubiquitously observed strain localisation and shear banding is critical to an in-depth understanding of the progressive failure mechanism of granular materi
Abstract The study of failure mechanisms from a microperspective demands a comprehensive understanding of the initiation and evolution of shear banding within granular materials. However, this topic is not fully understood due to the technical constraints in continuous quantification of the failure degree and visualization of particle interactions within soil specimens due to their inherent opacity. This paper reports the possibility of acoustic emission (AE) technique in characterizing the micr
To investigate the behaviour of sands at the particle-scale during shear failure, a series of triaxial compression tests was conducted on dry sands with varying confining stresses and relative densities. These tests were complemented by acoustic emission (AE) monitoring to analyse the frequency-dependent AE signals and characterise particle interactions in terms of crushing (>100 kHz) and rearrangement (<100 kHz). The results reveal a linear relationship between the relative breakage index
This study investigates the impact of cementation on the mechanical behaviour of sands with various cement contents (CSR – weight of cement relative to the total dry weight of the soil–cement mixture) in drained triaxial compression, employing both acoustic emission (AE) and environmental scanning electron microscopy measurements. The experimental findings, encompassing quantitative statistics of stress–strain relations, microstructural variations and AE characteristics, demonstrate that the add
This study investigates particle crushing mechanisms in granular soils during shearing through staged triaxial compression experiments performed at prescribed axial strains and varying confining stresses, integrating a high-performance acoustic emission (AE) measurement system. The study analyzed particle crushing-related parameters using grain size distribution (GSD)-based indices (relative breakage index B r and its rate Δ B r ) and AE-based parameters (high-frequency AE hits and hit rates ).
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