In Situ SEM Torsion Test of Metallic Glass Microwires Based on Micro Robotic Manipulation

Jiang, Chengpeng; Lu, Haojian; Cao, Ke; Wan, Wenfeng; Shen, Yajing; Lü, Yang

doi:10.1155/2017/6215691

Cited by 4 publications

(2 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the last 20 years, many researchers have developed in situ SEM test systems with capabilities other than tensile testing. For example, Jiang [6] developed an in situ SEM torsion testing system with which they tested metallic glass micro wires. In situ SEM test systems with multiple test modes have been developed as well.…”

Section: Introductionmentioning

confidence: 99%

Development of scanning electron microscope-compatible multiaxial miniature testing system

Rahman

Ngaile

Hassan

2019

Meas. Sci. Technol.

View full text Add to dashboard Cite

Knowledge of deformation and failure mechanisms at micro- to nano-length scales is important for the prediction of material behavior as well as the development of new materials with desired properties. In situ multiaxial testing with scanning electron microscopes (SEM) can reveal physical deformation mechanisms under realistic multiaxial loading conditions. Although in situ SEM testing has gained traction in recent years, there is currently no multiaxial in situ SEM testing stage available with axial-torsional loading capabilities which can generally be used in any SEM. In this study, we report the development of a multiaxial miniature testing system (MMTS) with a unique capability for performing axial-torsional testing of a tubular specimen with a 1–2 mm outer diameter, inside most SEMs. The different challenges of developing a multiaxial in situ SEM testing stage, such as small load frame size, appropriate specimen position, high vacuum compatibility of MMTS load frame components, as well as the development of installation accessories, were addressed. A custom SEM stage door was developed for the MMTS load frame. Verification tests have confirmed the successful development of the MMTS for in situ SEM testing. In addition, digital image correlation was used with recorded SEM images during the test to determine the surface strain.

show abstract

Section: Introductionmentioning

confidence: 99%

Development of scanning electron microscope-compatible multiaxial miniature testing system

Rahman

Ngaile

Hassan

2019

Meas. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…However, little was focused on the torsion test of micro-wires in SEM. Recently, Jiang et al [10] twisted MG wires in SEM with the aid of a micro-robot.…”

Section: Introductionmentioning

confidence: 99%

Development of in-situ SEM torsion tester for microscale materials

et al. 2019

View full text Add to dashboard Cite

An in-situ SEM (scanning electron microscope) micro-torsion tester with high resolution is developed based on electromagnetism. The torque is controlled and measured using a coil-magnet component. The torsion angle is measured by a non-contact transducer based on Hall-effect. The calibration results show that the torque capacity of this tester is 1.6×10-4 Nm with resolution of 1×10-9 Nm. In-situ torsion test of MG (metallic glass) wire (Pd 40 Cu 30 Ni 10 P 20) with a diameter of 111 µm and a length of 3 mm is performed using this tester in SEM. A linear torque-torsion angle curve is obtained and the calculated shear modulus of the sample is 24.7 GPa. Meanwhile, the deformation process of the sample is simultaneously observed using SEM. It is the first time that the measurement of shear stress-strain and high resolution morphology observation are carried out simultaneously.

show abstract

Non-contact temperature control and stereo digital image correlation for high-temperature testing of miniature tubular specimens

Rahman

Ngaile

Hassan

2021

Review of Scientific Instruments

View full text Add to dashboard Cite

Component failures very often occur due to high temperature and multiaxial stress states arising at critical component locations. To imitate such loading conditions, a multiaxial miniature testing system (MMTS) with axial, torsional, and internal pressurization capabilities for high-temperature testing of miniature tubular specimens has been developed. Among many challenges of developing the MMTS, uniform heating, temperature measurement and control, and surface strain measurement on a miniature tubular specimen at high temperatures have significant difficulties. This paper addresses two significant challenges: first, the development of a non-contact temperature control system using infrared thermography to uniformly heat a miniature specimen of 1 mm outer diameter (OD), and second, the development of a stereo digital image correlation (stereo-DIC) setup for strain measurement on the miniature specimen subjected to high temperature. The developed control system maintains the test temperature through a closed feedback loop and employs a fail-safe mechanism to protect the MMTS load frame components against unanticipated temperature rises. The thermocouple wire-size effect on the measured temperature was examined for three different wire sizes: 0.05, 0.25, and 0.5 mm for accurate emissivity determination required for infrared thermography. Emissivities of the specimen surface at different high temperatures were experimentally determined. Inherent error analysis of the developed high-temperature stereo-DIC setup showed acceptable strain measurement uncertainty. The effectiveness of the developed non-contact temperature control system and high-temperature stereo-DIC setup has been verified by performing tensile testing of a 1 mm OD specimen at 500 °C.

show abstract

In Situ SEM Torsion Test of Metallic Glass Microwires Based on Micro Robotic Manipulation

Cited by 4 publications

References 47 publications

Development of scanning electron microscope-compatible multiaxial miniature testing system

Development of scanning electron microscope-compatible multiaxial miniature testing system

Development of in-situ SEM torsion tester for microscale materials

Non-contact temperature control and stereo digital image correlation for high-temperature testing of miniature tubular specimens

Contact Info

Product

Resources

About