Effect of Deflection Rate on Bending Deformation Behavior of Fe-Based Shape Memory Alloy

2014 ◽  
Vol 566 ◽  
pp. 116-121
Author(s):  
Keizo Nishikori ◽  
Takeshi Iwamoto
Keyword(s):  
Shape Memory ◽  
Static Loading ◽  
Deformation Behavior ◽  
Rate Sensitivity ◽  
Bending Test ◽  
Bending Deformation ◽  
Three Point Bending ◽  
Positive Rate ◽  
The Impact ◽  
Deflection Rate

In this study, three-point bending test is conducted at various deformation rate by using a thin plate of Fe-based alloy. The rate sensitivity of its bending deformation during loading and shape memory effect by heating after unloading are investigated experimentally. The results obtained are summarized as bellows. (1) In the case where the quasi-static loading was applied, the positive rate sensitivity, which means the stress level increases with increasing the deflection rate, can be observed slightly. (2) It is hard to observe that recovery of deflection by SME depends on deflection rate under quasi-static loading. (3) In the case where the impact loading was applied, the positive rate sensitivity can be observed clearly.

An Estimation of Joint Strength by Using Fe-Based Shape Memory Alloy Subjected to Bending Deformation at Various Deformation Rate

2014 ◽  
Vol 626 ◽  
pp. 228-233 ◽  
Author(s):  
Kazuki Fujita ◽  
Keizo Nishikori ◽  
Takeshi Iwamoto
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Deformation Rate ◽  
Bending Strength ◽  
Rate Sensitivity ◽  
Force Balance ◽  
Bending Test ◽  
Structural Members ◽  
Bending Deformation ◽  
Three Point Bending

In various kinds of shape memory alloy (SMA), Fe-based SMA (Fe-SMA) shows smaller shape memory effect compared with the other SMAs. However, Fe-SMA shows huge advantages on the excellent formability, machinability, etc. Moreover, its production cost is cheaper than other SMAs; therefore, the alloy is attempted to be applied to structural members such as joints and dampers. Since bending deformation at higher deformation rate is generated in the members, especially the joints, due to impact force such as earthquake or wind, a clarification on the bending strength of the joints at various deformation rate is strongly required. In this study, at first, it is attempted that the bending strength and its rate sensitivity of the joints which consist of Fe-based SMA are experimentally estimated by the three-point bending test at various deformation rate. Then, the force balance equation is challenged to be derived to predict the bending strength.

A Study on Tensile Deformation Behavior in Fe-Based Shape Memory Alloy by Rate Sensitive Transformation Kinetics Model

2016 ◽  
Vol 725 ◽  
pp. 77-81
Author(s):  
Anthony Budiaman ◽  
Kazuki Fujita ◽  
Takeshi Iwamoto
Keyword(s):  
Numerical Simulation ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Deformation Behavior ◽  
Tensile Deformation ◽  
Rate Sensitivity ◽  
Kinetics Model ◽  
Strain Rates ◽  
Transformation Kinetics ◽  
Tensile Deformation Behavior

Fe-based shape memory alloy (Fe-SMA) shows a shape memory effect (SME) governed by forward and reverse stress-induced martensitic transformation (SIMT). Fe-SMA has been applied to joints and dampers utilized at various strain rates. To utilize Fe-SMA better, it is necessary to understand the mechanical properties in a wide range of strain rate. In previous study, the results of a tensile test at various strain rates show a rate-sensitivity, however, the mechanism of rate-sensitive tensile deformation behavior is still unclear. Thus, a numerical simulation using a transformation kinetics model is needed to clarify the mechanism. Some transformation kinetics models have been proposed, however, the rate sensitivity cannot be included. In this study, the rate sensitivity of volume fraction martensite is considered into the transformation kinetics model as an improvement of the past-proposed model. The numerical simulation of the uniaxial tensile test at various strain rates is performed to reproduce transformation behavior of the martensite phase. Then, the model is validated by comparing to the experimental results. Afterwards, the mechanism of rate-sensitive tensile deformation behavior of Fe-SMA is discussed.

Assessment of Sandwich Beam in Three-Point Bending for Measuring Adhesive Shear Modulus

2001 ◽  
Vol 123 (3) ◽  
pp. 322-328 ◽  
Author(s):  
Jianmei He ◽  
Martin Y. M. Chiang ◽  
Donald L. Hunston
Keyword(s):  
Shear Modulus ◽  
Sandwich Beam ◽  
Adhesive Layer ◽  
Test Method ◽  
Bending Test ◽  
Beam Specimen ◽  
Element Analysis ◽  
Three Point Bending ◽  
The Impact ◽  
Made In

A finite element analysis (FEA) was conducted to examine the feasibility of determining the shear modulus of an adhesive in a bonded geometry using a three-point bending test on a sandwich beam specimen. The FEA results were compared with the predictions from two analytical solutions for the geometry used to determine the impact of the assumptions that were made in these analyses. The analytical results showed significantly different to the values obtained from other experiments on bulk samples of the adhesive in the glassy region. Although there were some agreements in rubbery region, the negligible sensitivity of the beam stiffness to the presence of adhesive layer makes the agreements very questionable. To examine the possible explanations for these differences in glassy adhesives, sensitivity analysis was conducted to explore the effects of experimental variables. Some possible reasons for the differences are discussed, but none of these reasons taken alone satisfactorily account for the discrepancies. Until an explanation is found, the three-point bending test using a sandwich beam specimen to determine the adhesive shear modulus might not be a desirable test method, at least for the range of geometry examined in this study.

Development of the impact resistance for the composite limb protectors via three point bending test of lamb metacarpus

2013 ◽  
Vol 24 ◽  
pp. S29
Author(s):  
Ibrahim Kutay Yilmazcoban ◽  
Ahmet Cagatay Cilingir ◽  
Yasar Kahraman ◽  
Sedat Iric ◽  
Cetin Karakaya
Keyword(s):  
Impact Resistance ◽  
Bending Test ◽  
Three Point Bending ◽  
The Impact

A Three-Point Bending Test Machine for Studying the Thermomechanical Properties of Shape Memory Alloys

2018 ◽  
Vol 61 (2) ◽  
pp. 306-312 ◽  
Author(s):  
V. S. Kalashnikov ◽  
V. V. Koledov ◽  
D. S. Kuchin ◽  
A. V. Petrov ◽  
V. G. Shavrov
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Thermomechanical Properties ◽  
Bending Test ◽  
Test Machine ◽  
Three Point Bending

Modeling the Impact Response of HDPE Fuel Tank Material

2009 ◽  
Author(s):  
Xinran Xiao ◽  
Vinayshankar Virupaksha
Keyword(s):  
Deformation Behavior ◽  
High Density Polyethylene ◽  
Method Development ◽  
Fuel Tank ◽  
Impact Response ◽  
Lateral Impact ◽  
Three Point Bending ◽  
Deformation And Fracture ◽  
Fracture Behaviors ◽  
The Impact

As a part of the effort on modeling method development for crashworthiness prediction of vehicle structures, this paper examines the impact response of a multilayer high density polyethylene (HDPE) fuel tank material. The deformation behavior of HDPE under lateral impact was investigated by flexural experiment using three-point bending, and by driven dart impact with different velocities at ambient and −40°C. The large deformation and fracture behaviors of multilayer HDPE under impact loading at different rates and temperatures were simulated using LS-DYNA®.

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