Introduction of Laboratory ( Digital Manufacturing )
Research Field: Control Systems
Intermetallics Materials Strength and Deformation
at Elevated Temperatures Shape Memory
Researches on Materials Strength and Deformation Mechanisms
Various types of structural and/or functional materials (metals and alloys, ceramics, polymers and composites) are used in modern mechanical systems like airplanes.
In this laboratory, mostly metallic materials are focused in its strength and deformation, especially at elevated temperatures. The main subject is concerning the structure-property relationships and their microscopic and/or atomistic mechanisms.
Studies are under way in this laboratory to characterize the strength of titanium aluminide intermetallics that is prospective for lightweight and high-temperature structural applications in future airplanes. Thermal and mechanical properties of NiTi shape memory alloys and their alloying effects are also investigated.
In addition, a very basic study about grain boundary sliding behavior in bi-crystal specimens is being carried out to clarify the grain boundary dislocation model that can describe the special behavior of coincidence grain boundaries.
Technological profession staff
Research Field: Elastic-Plastic Analysis of Solids
Plasticity saves the earth's environment
Metals have the property of permanent deformation. It is referred to as plasticity. Scientific knowledge on the metal plasticity is a must for developing and establishing the manufacturing technology that is friendly to the earth's environment. The mission of Kuwabara lab is to perform ultimate studies on metal plasticity and to contribute to the earth's environment and the welfare of humanity.
- To develop novel material testing apparatus, as shown in the pictures above, for precisely measuring the anisotropic plastic behavior of metal sheets and tubes under a variety of loading paths.
- To develop and validate phenomenological constitutive models (anisotropic yield criteria and its associated/non-associated flow law) through the comparison of observed material responses with those predicted using phenomenological plasticity models
- To establish the methodologies for accurate FEM simulations based on refined material models for steels, aluminum, copper, titanium and magnesium alloys. These metals are very important for establishing the manufacturing technology that is friendly for the earth's environment.
- To develop intelligent metal forming machines
Technological profession staff
Research Field: Strength of Materials
Prediction of Deformation and Fracture of Mechanical Structure
When any body is subjected to external force, it deforms as the spring may expand in proportion to applied force (Hooke's law), and internal force called stress is generated inside it. When large stress is generated inside the mechanical structure, even if the deformation is small, it may be destroyed. Therefore, it is necessary to estimate the stress acting in the body and how to deform when the machine is designed. Especially, material behavior at high temperature is not well known because structural change called phase transformation occurs and complicated deformation which does not follow Hooke's law is generated.
In our laboratory, the basic experiment and the computer simulation for deformation / stress have been performed to clarify inelastic deformation behavior at high temperatures.
Research Field: Material Engineering for Machinery
Advanced composite materials for aerospace, automobile, robot, and energy system
Advanced composite materials are one of the key technologies in the innovation of aerospace, automobile, robot, and energy system in future. We are attempting to develop original composite materials such as carbon fiber reinforced plastics (CFRP), ceramic matrix composites (CMC), carbon nanotube composites, and ablators to impress other researchers in all over the world. We are continuously conducting joint research with Japan Aerospace Exploration Agency (JAXA). Under the collaboration, we are using equipment in JAXA Chofu Space Center, and making some special experiments such as mechanical testing at high temperatures ( > 1700 K), micro-nano mechanical testing using electron microscope, material durability test in plasma wind tunnel and others.