Article
Chemistry, Analytical
Xudong Yang, Zexiao Li, Linlin Zhu, Yuchu Dong, Lei Liu, Li Miao, Xiaodong Zhang
Summary: This paper presents an integrated system-processing platform for the processing, measurement, and evaluation of taper-cutting experiments on hard and brittle materials. A spectral confocal sensor is introduced to assist in the assembly and adjustment of the workpiece. A method for the calculation of BDTD is proposed in order to accurately obtain the BDTDs of materials.
Article
Engineering, Multidisciplinary
Richard M. Christensen
Summary: The transition from ductile to brittle behavior is determined to occur at specific values of certain material properties, with a strong relationship found with the elements of the Periodic Table, particularly iron. These findings extend beyond elemental materials and have significant implications for understanding the elastic and failure properties of materials. These developments build upon previous empirical observations from Pugh [7] and provide a broader insight into material behavior.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2021)
Article
Chemistry, Physical
Yinhui Wang, Zhiqiang Liang, Wenxiang Zhao, Xibin Wang, Hao Wang
Summary: This work investigates the anisotropic cutting mechanisms on the surface quality of sapphire in ultra-precision machining. The results show that the ductile-to-brittle transition (DBT) depth is influenced by the machining direction. The evaluation of DBT depths, subsurface damage, and cutting forces is essential for optimizing the precision machining of sapphire.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Dennis Schab, Susann Zahn, Harald Rohm
Summary: Cutting speed is crucial for the behavior and final quality of viscoelastic foods, impacting the ductile-brittle transitions in cutting force profiles. With an increase in cutting speed, effects similar to changes in moisture content and solid fat content were observed, providing a basis for further research and numerical modeling of the cutting process. Visualizing the cause-effect relations for real foods will enhance understanding of distinct loading phenomena during food cutting.
Review
Automation & Control Systems
Xufeng Sun, Peng Yao, Shuoshuo Qu, Shimeng Yu, Xianpeng Zhang, Wei Wang, Chuanzhen Huang, Dongkai Chu
Summary: This paper reviews the generation of high strain rate in different machining processes and analyzes the mechanism and characteristics using molecular dynamics (MD) and finite element (FE). It also compares the machining characteristics in ultra-high-speed cutting and ultra-precision cutting. The contradictory nature of the ductile-brittle transition (DBT) and brittle-ductile transition (BDT) under high strain rate in these two machining processes is discussed. Additionally, the paper proposes a solution to increase machinability and reduce surface damage in ultra-precision cutting by appropriately increasing the cutting speed.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Physics, Fluids & Plasmas
J. S. Langer
Summary: This paper attempts to construct a first-principles theory of the fracture toughness of crystalline solids based on the thermodynamic dislocation theory. The analysis results show that the theory's predictions quantitatively agree with experimental data, including both brittle and ductile fracture under various conditions.
Article
Chemistry, Physical
Chenghao Chen, Min Lai, Fengzhou Fang
Summary: This paper investigates the crack formation mechanism in nano-cutting of gallium arsenide, finding that the main damage changes from dislocation to phase transformation with increasing cutting speed. The amount of cracks increases with higher cutting depth, and the deformation mode turns from ductile to a combination of ductile and brittle.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Yunfa Guo, Yan Jin Lee, Yu Zhang, Anastassia Sorkin, Sergei Manzhos, Hao Wang
Summary: Magneto-plasticity refers to the phenomenon where a weak magnetic field can alter the plasticity of materials, and it offers a potential solution for enhancing ductile-mode cutting of brittle materials. This study demonstrates the susceptibility of non-magnetic single-crystal calcium fluoride to the magneto-plastic effect and confirms the influence of magneto-plasticity on the material's plastic deformation and crack propagation. The research also reveals an anisotropic influence of the magnetic field on the cutting direction and crystal orientation, and an analytical model is derived to describe this influence.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Review
Mechanics
Richard M. Christensen
Summary: The formalism of isotropic elasticity theory can benefit from a review and re-examination of its structure, leading to a realignment of the basic moduli type properties. Understanding ductile versus brittle failure behaviors becomes more accessible with this approach. The ductile/brittle transition in uni-axial tension can be specified in terms of the two elastic moduli 2 mu and k. The implications of these findings are discussed in the context of general failure theory.
APPLIED MECHANICS REVIEWS
(2023)
Article
Engineering, Industrial
Xiao Han, Dongdong Xu, Dragos Axinte, Zhirong Liao, Hao Nan Li
Summary: The machining of metal matrix composites (MMCs) presents challenges due to the mismatch of mechanical and thermal properties between the matrix and reinforced particles. This paper explores the effects of cutting regimes on surface integrity in MMC machining and identifies two different cutting mechanisms – semi-brittle and ductile cutting – based on feed rate/uncut chip thickness. The semi-brittle cutting regime leads to noticeable damaged surface morphology with a high density of fractured particles.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Automation & Control Systems
Shijin Lu, Zengqiang Li, Junjie Zhang, Tao Sun
Summary: This paper investigates the cutting characteristics of SiCp/Al material and develops a mathematical model to predict the critical undeformed chip thickness for the brittle-to-ductile cutting mode transition. Experimental validation of the model's accuracy is conducted, providing guidance for achieving ultra-smooth machined surfaces of SiCp/Al.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Qi Liu, Zhirong Liao, Jian Cheng, Dongdong Xu, Mingjun Chen
Summary: This paper investigates the evolution of different cutting mechanisms with the change of uncut chip thickness (UCT) in KDP orthogonal cutting processes, and proposes a novel theoretical model to explain the cutting phenomena, which is well validated by the analysis of cutting forces and machined surface quality. However, three kinds of surface defects were observed, including micro pits, micro craters, and edge chipping.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Multidisciplinary
Hudson Borja da Rocha, Lev Truskinovsky
Summary: Power law distributed fluctuations are known to accompany terminal failure in disordered brittle solids, emerging universally from threshold-type nonlinearity, quenched disorder, and long-range interactions. Systems are expected to transition between brittle and quasi-brittle (ductile) responses, characterized by a power law distribution of avalanches in the former and predominantly Gaussian statistics of avalanches in the latter. The self-tuning of the system towards the boundary separating brittle and ductile regimes is indicated by robust criticality observed in cases like earthquakes and collapsing porous materials.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Mechanics
Branislav Djordjevic, Sreten Mastilovic, Aleksandar Sedmak, Aleksandar Dimic, Milan Kljajin
Summary: The phenomenon of ductile-to-brittle transition in ferritic steels has been a research challenge for the last 50 years. Fracture mechanics concepts have been used to characterize this problem and statistical methods have been applied to deal with the scatter of experimental data. This paper provides a historical overview of the studies in this field and presents two new approaches.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Milos Pjevic, Mihajlo Popovic, Ljubodrag Tanovic
Summary: This paper conducted a detailed experimental analysis on the effect of tool tip radius and cutting speed on the micro-cutting mechanism of Plavi tok marble. It was found that the plastic deformation mode can be achieved in processing Plavi tok marble, and the range of plastic deformation zone is influenced by the tool tip radius and cutting speed. The intensity of lateral/radial destruction in the brittle fracturing mode was also directly dependent on the processing conditions.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2021)