東京大学 · 工学
Fabien Briffod教授の研究室では、金属材料の疲労挙動に注目し、特に多相系や複雑な微細組織を有するマグネシウム合金やマルテンサイト鋼、銅/ niobium ラミネート材料など、微視的構造と力学的挙動の関係を、実験と顕微鏡的・数値的シミュレーションを融合して解明しています。特に、結晶塑性有限要素法を用いた多スケールな微細組織モデリングと、疲労き裂発生の予測に向けた破壊メカニズムの解明が中心です。応力・ひずみ履歴や疲労寿命の予測に寄与する材料の異方性や、LPSO相やマルテンサイト構造の影響を詳細に分析しています。
Figures are computed from collected data and may differ slightly.
The fatigue behavior of four extruded Mg-Y-Zn alloys containing different volume fractions of long-period stacking ordered (LPSO) grains was investigated through a comparative study combining experiments and crystal plasticity finite element simulations. Strain controlled low-cycle fatigue experiments were conducted at different strain amplitudes and revealed a limited cyclic hardening in Mg89Zn4Y7 alloy or softening in Mg99.2Zn0.2Y0.6 and Mg97Zn1Y2 alloys. A decrease in the fatigue life against
A computational study for the modeling of lath martensitic steels, considering morphological and crystallographic features, is presented. A two-dimensional multi-scale tessellation is proposed to generate idealized microstructures with several scales of heterogeneities. The proposed approach is applied to lath martensite where prior austenite grain, packet and block boundaries are explicitly considered as well as their crystallographic relationships. The role of the different sources of heteroge
A numerical study was conducted to evaluate the fatigue crack initiation stage in pure α-iron. A two-dimensional synthetic polycrystalline aggregate was generated with Voronoi tessellation to represent the microstructure. Low-cycle fatigue experiments under fully reversed strain-controlled loading were conducted for different strain amplitudes. The stable stress-strain hysteresis loops were used to calibrate a non-linear kinematic hardening model for metal plasticity suitable for cyclic simulati
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