Evaluating shape memory behavior of polymer under deep-drawing conditions

Xu, Wensen; Wu, Shuiliang; Balamurugan, Ganesh; Thompson, Michael R.; Brandys, Frank A.; Nielsen, Kent E.

doi:10.1016/j.polymertesting.2017.07.009

Cited by 11 publications

(5 citation statements)

References 9 publications

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“…Nuclear medicine replicas made of acrylic glass and fabricated with subtractive methods are usually simply shaped and don't represent patient-individual specifics [6]. More complex structures can be obtained by reshaping or bending the acrylic glass, but the degree, energy, speed, and temperature needed for the reshaping can largely influence the properties and functions of the replicas [18]. In addition, gluing of the hollow parts is required, and while clinical data show that assembling per se does not reduce the quality of the replicas, on the other hand the complexity of the reshaping process requires a special material knowledge, particularly in the choice of materials for watertight assembling.…”

Section: Discussionmentioning

confidence: 99%

3D printing of fillable individual thyroid replicas based on nuclear medicine DICOM data used as phantoms for gamma probe calibration

et al. 2019

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Aim To proof the feasibility of manufacturing patient-indivdual (anthropomorphic) thyroid replicas from I-124 PET DICOM datasets by means of 3D printing. A possible field of application is the use of those phantoms for the calibration of gamma probes. Methods After editing of the DICOM datasets using several software types and transferring into a dedicated stereolithography format, 10 fillable thyroid replicas (35–200 mL) made of polylactide acid were manufactured via 3D printing. All replicas were filled with a water-solution containing 3.5 MBq I-131 and applied to a standard neck phantom. Calibration factor measurements were carried out using a clinical gamma probe. Measurements were performed with three different tilts: + 15°, 0° and –15°. The influence of the replicas’ volume and the tilt was investigated. Results Manufacturing of the replicas was successful in all cases. The time required for data processing was 13 ± 2 (median: 12, range: 9–25) min and 4–11 h for 3D printing (size-dependent). The printing process could be done overnight. Measured mean calibration factor for straight gamma probe positioning (0° tilt) was 31 965 ± 3360 (33 893, 25 470–34 253) cpm/MBq. A tilt of –15° resulted in lower calibration factors (–7.7 %), whereas a tilt of + 15° led to higher values (+ 9.5 %); p = 0.001. The calibration factors were highly inversely proportional correlated to the volume of the replicas (r = –0.91, p < 0.001). Conclusion 3D printing of patient-individual (anthropomorphic) fillable thyroid replicas was feasable for a large range of volumes. The study demonstrates the influence of the volume as well as the tilt of the measured object for calibration factor measurements with gamma probes.

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Section: Discussionmentioning

confidence: 99%

3D printing of fillable individual thyroid replicas based on nuclear medicine DICOM data used as phantoms for gamma probe calibration

et al. 2019

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“…Leu 11 found that plastic instability was defined by the measurement of the ultimate extension ratio. Xu et al 12 have discovered that the complex recovery behavior of a laminate undergoing a tensile bending process was depending on the operation and material parameters.…”

Section: Mentioned Thementioning

confidence: 99%

Finite element analysis of deep drawing

Chen

Lai

2019

Advances in Mechanical Engineering

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With the advancement of technology, aiming for achieving a greater lightness and smaller size of 3C products, parts processing technology not only needs to explore the basic scientific theory of materials but also needs to discuss the process of deep drawing numerical and the plastic deformation. This study is based on the square shape of the deep drawing numerical simulation, and aluminum alloy plastic flow stress was input into the finite element method for simulation of plastic deformation in the aluminum alloy friction, mold clamping force, and frequency, as well as amplitude in the influence of forming mechanism and the drawing ratio of aluminum alloy. Finite element analysis software has the function of grid automatic rebuild, which can rebuild the broken grid in the analysis into a complete grid shape, which can avoid the divergence caused by numerical calculation in the analysis process. The greater the obtained error value, the best plastic parameters can be found.

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“…With the insulated lid in place the recovery angles could only be observed infrequently until the final angle was recorded after 24 h [22].…”

Section: Shape Recovery Testingmentioning

confidence: 99%

Recovery behaviour of shape memory polyurethane based laminates after thermoforming

Balamurugan

et al. 2017

Smart Mater. Struct.

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Shape memory polymers (SMPs) can be used to produce a new class of decorative films capable of improved formability and shape recovery in polymer laminates, which are increasingly being used for automotive, aerospace, construction and commercial applications. As a relatively new field there is little knowledge on the shape recovery behaviour of laminates with a SMP film and few methods of quantify that behaviour. The influences of different variables that affect the recovery behaviour of thermoplastic shape memory polyurethanes based laminates including ambient temperature (45 °C and 65 °C), material modulus, and adhesive strength were investigated after thermoforming, through both experimental and modelling methods. The empirical model assisted in identifying the contributions of the adhesive to transfer stresses, which dampened the recovery of the laminate with lower shear strength adhesives. Increasing ambient temperature and the film modulus increased both the final angle recovery ratios and recovery rates.

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Evaluating shape memory behavior of polymer under deep-drawing conditions

Cited by 11 publications

References 9 publications

3D printing of fillable individual thyroid replicas based on nuclear medicine DICOM data used as phantoms for gamma probe calibration

3D printing of fillable individual thyroid replicas based on nuclear medicine DICOM data used as phantoms for gamma probe calibration

Finite element analysis of deep drawing

Recovery behaviour of shape memory polyurethane based laminates after thermoforming

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