You can tell the condition by listening to the sound!
Monozukuri (Saitama University Research Seed Collection 2025-27 p.55)
Keywords: Acoustic Emission, Material Mechanics, Non-Destructive Testing, Fracture Analysis, Composite Materials, Biological Sounds, Frequency Analysis
Acoustic Emission (AE) technology is a non-destructive testing method that detects not only sounds from cracks, friction, and leaks within materials but also biological sounds, such as joint sounds. It is used in various fields including construction, civil engineering, manufacturing, medicine, and material evaluation. The AE method detects sounds (AE sounds) generated within materials using AE sensors installed on the surface, similar to the relationship between earthquakes and seismometers. Therefore, like earthquakes, information such as the location of AE sound generation, sound intensity, and sound frequency can be obtained from multiple seismometer data. The frequency characteristics of AE waveforms are said to represent the types of damage, and our laboratory conducts evaluations of damage accumulation behavior primarily focused on carbon fiber reinforced composites (CFRP). By interpreting the conditions under which damage occurs not only from a materials mechanics perspective but also from a thermodynamic perspective, we also perform residual life evaluations based on entropy assessment.
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Take Nobu Sakai, Professor Graduate School of Science and Engineering, Department of Mechanical Science, Production Science Area 【Recent Research Themes】 ● Elucidation of viscoelastic deformation mechanisms of polymers through molecular dynamics simulations ● Evaluation of viscoelastic properties of polymers and composite materials ● Finite element analysis of the progression mechanism of pressure ulcers ● Development of a method for evaluating the remaining life of materials based on entropy assessment
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【Appeal Points to the Industry】 ● Applicable to any field as long as there is vibration or sound. ● Acoustic evaluation is possible as long as a sensor can be attached. ● Miniaturization and wireless options are also possible. ● If the relationship between evaluation items and frequency can be clarified, phenomena can be elucidated. ● The state during vibration generation can be grasped, and the cause can be identified. 【Examples of Practical Use, Applications, and Utilization】 ● Quality evaluation of products through vibration assessment of operating equipment. ● Disease evaluation of patients with osteoarthritis of the knee using joint sounds. ● Localization of the tricuspid valve through evaluation of chest surface vibration distribution. ● Evaluation of transverse crack formation behavior in composite materials. ● Evaluation of damage modes in composite materials.
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The Saitama University Open Innovation Center is a center that functions as a liaison office for industry-academia-government collaboration. It consists of three departments: the Industry-Academia-Government Collaboration Department, the Intellectual Property Department, and the Startup Support Department, each staffed with coordinators well-versed in various fields. The center's activities include solving technical challenges in companies, supporting the implementation of joint research, and conducting technology transfer aimed at introducing and utilizing Saitama University's intellectual property.
