Bending and punching characteristics of aluminum sheets using the quasi-continuum method

• Man-Ping Chang,
• Shang-Jui Lin and
• Te-Hua Fang

Beilstein J. Nanotechnol. 2022, 13, 1303–1315, doi:10.3762/bjnano.13.108

• punch and on both sides of the substrates. Besides, fracture strength, residual flash, and the atomic displacement vector are observed and discussed regarding the behaviors of the nano-punching process under various conditions. Based on the results, the Al workpiece with the X[111]Y[−110] orientation

• strain distribution, and fracture strength were provided as well as the interfacial mechanics and punching characteristics of each nano-punching model. Model and Methodologies The simulation model of the nano-punching system comprises a punch and a single crystalline Al workpiece, as shown in Figure 1

• substrate (Figure 3b). Eventually, the workpiece fractures from the substrate at a critical stress, which is also defined as fracture strength (Figure 3c). After the workpiece is broken and the loading stage goes toward the end, the punch moves up and returns to the original position. According to the

Graphene composites with dental and biomedical applicability

• Sharali Malik,
• Felicite M. Ruddock,
• Adam H. Dowling,
• Kevin Byrne,
• Wolfgang Schmitt,
• Ivan Khalakhan,
• Yoshihiro Nemoto,
• Hongxuan Guo,
• Lok Kumar Shrestha,
• Katsuhiko Ariga and
• Jonathan P. Hill

Beilstein J. Nanotechnol. 2018, 9, 801–808, doi:10.3762/bjnano.9.73

• in the fracture surface of the polymer matrix. The mean dynamic viscosity, compressive fracture strength and compressive modulus and associated standard deviations for the control group and the groups prepared with poly(acrylic acid) solutions containing graphene are shown in Table 2. There was a

• strength data with increasing concentration of graphene added to the poly(acrylic acid) solutions as shown in Figure 4. The group prepared using a poly(acrylic acid) solution containing 0.5 mg of graphene produced the highest mean compressive fracture strength (118.2 ± 8.3 MPa) which was a 27% increase

• groups prepared with poly(acrylic acid) solutions containing graphene compared with the control group as shown in Table 2. Similarly to the results from the compressive fracture strength data, the group which produced the highest mean compressive modulus (3.56 ± 0.32 GPa) was the group containing 0.5 mg

Fracture behaviors of pre-cracked monolayer molybdenum disulfide: A molecular dynamics study

• Qi-lin Xiong,
• Zhen-huan Li and
• Xiao-geng Tian

Beilstein J. Nanotechnol. 2016, 7, 1411–1420, doi:10.3762/bjnano.7.132

• and Vibration, Xi’an Jiaotong University, Xi’an 710049, China 10.3762/bjnano.7.132 Abstract The fracture strength and crack propagation of monolayer molybdenum disulfide (MoS2) sheets with various pre-existing cracks are investigated using molecular dynamics simulation (MDS). The uniaxial tensions of

• location of crack does not influence the fracture strength. With the increase of crack length, the fracture strength of monolayer MoS2 sheets reduces almost linearly, and the fracture of monolayer MoS2 sheets is transformed from almost brittle to ductile. By making comparison between the MDS results and

• model without finite size effect. Finally, the MDS results of monolayer MoS2 sheets with different angled crack are also analyzed based on the continuum fracture mechanics model. Keywords: crack propagation; fracture strength; molecular dynamics simulation; monolayer molybdenum disulfide; pre-existing

Chains of carbon atoms: A vision or a new nanomaterial?

• Florian Banhart

Beilstein J. Nanotechnol. 2015, 6, 559–569, doi:10.3762/bjnano.6.58

• . [19] have related the fracture strength to a specific strength of carbon chains of 6.0–7.5 × 107 Nm/kg which would be the highest of all known materials. A Young’s modulus of 3.3 × 1013 Pa has been calculated [19] which is much higher than for graphene (approx. 1012 Pa). In sp2 networks like graphene