Characterization and prediction of the nonlinear creep behavior of 3D-printed polyurethane acrylate

2021 ◽  
pp. 102583
Author(s):  
Ruiqi Hu ◽  
Xiangyu Zhang ◽  
Yang Chen ◽  
Chao Zhang
Keyword(s):  
Creep Behavior ◽  
Nonlinear Creep ◽  
Polyurethane Acrylate ◽  
3D Printed

The Creep Behavior of a Floating Beam

1983 ◽  
Vol 27 (04) ◽  
pp. 271-280
Author(s):  
Paul C. Xirouchakis
Keyword(s):  
Cross Section ◽  
Creep Behavior ◽  
Failure Time ◽  
Failure Criteria ◽  
Secondary Creep ◽  
Nonlinear Creep ◽  
Double Membrane ◽  
Creep Response ◽  
Distributed Load ◽  
Linear Viscoelastic

The creep response is obtained for an inhomogeneous beam, with simple end supports, resting on a liquid foundation and subjected to a sinusoidally distributed load. The Norton-Bailey constitutive equations are used to describe secondary creep behavior and elastic effects are retained. The liquid foundation is taken as a continuous Winkler support. The beam cross section is replaced by a double-membrane model. The implications are discussed of using stress or deflection failure criteria in determining the magnitude of the instantaneous breakthrough load. The linear viscoelastic as well as nonlinear creep beam response is obtained explicitly. The influence of the beam geometric and material characteristics and of the presence of the liquid foundation on the growth of the deflections with time is discussed. The variation of the breakthrough load with failure time is also explored. Results obtained are compared with available sea ice laboratory test data.

Time-Temperature-Stress Superposition Principle: Brief Description and Application to Polymer Creep Behavior

2012 ◽  
Vol 602-604 ◽  
pp. 681-684
Author(s):  
Yong Hua Li ◽  
Cheng Kai Jiang
Keyword(s):  
Temperature Stress ◽  
Stress Level ◽  
Creep Behavior ◽  
Physical Aging ◽  
Superposition Principle ◽  
Nonlinear Creep ◽  
Stress Superposition ◽  
Lower Temperature ◽  
Term Creep

A new accelerated characterization model for creep performances was briefly introduced first, which considers both the effects of temperature and stress level, named time-temperature- stress superposition principle (TTSSP). TTSSP assumes that the influence of stress level on the intrinsic time is similar to that of temperature for the creep behavior, as well as damage and physical aging. The creep curves at different state can be shifted into a master curve at reference state using TTSSP. Then the long-term creep behavior of viscoelastic materials at lower temperature and/or stress level can be predicted from the short-term ones. Finally, TTSSP was used to investigate the nonlinear creep behavior of high-density polyethylene (HDPE). It was shown that the long-term creep behavior of HDPE can be predicted successfully.

Characterization of nonlinear creep behavior of two food products

1991 ◽  
Vol 35 (6) ◽  
pp. 1209-1233 ◽  
Author(s):  
Renfu Lu ◽  
V. M. Puri
Keyword(s):  
Creep Behavior ◽  
Food Products ◽  
Nonlinear Creep

A Model for Nonlinear Creep of Textile Fibers

1977 ◽  
Vol 47 (10) ◽  
pp. 647-649 ◽  
Author(s):  
V. B. Gupta ◽  
Satish Kumar
Keyword(s):  
Creep Rate ◽  
Creep Behavior ◽  
Nylon 6 ◽  
Elastic Behavior ◽  
Nonlinear Creep ◽  
Textile Fibers

A model is presented to represent the nonlinear visco-elastic behavior, particularly the creep behavior, of polymeric solids like textile fibers. The equations obtained are shown to predict approximately the creep and creep-rate curves for a nylon 6 filament.

Creep Behavior of Building Silicone Sealant under Long-Term External Loading and its Time-Stress Equivalence

2014 ◽  
Vol 633 ◽  
pp. 451-454
Author(s):  
Xiao Gen Liu ◽  
Yi Wang Bao ◽  
Xiu Fang Wang
Keyword(s):  
Creep Curve ◽  
Creep Behavior ◽  
External Loading ◽  
Nonlinear Creep ◽  
Creep Tests ◽  
Time Stress ◽  
Silicone Sealant ◽  
Term Creep ◽  
Term Performance

The main mechanics behavior character of building silicone sealant is its time dependence£¬which lies in the existence of the interior timepiece or the characteristic time. The creep behaviors were fundamental to evaluating the long-term performance of the building silicone sealant under long-term external loading. A series of creep tests of building silicone sealant were conducted in the laboratory under different combinations of external loads, the characteristics of the creep curve were obtained. In this work, the creep behaviors of building silicone sealant were also investigated under various temperatures at invariable stress. The test measurements show that the creep behavior of building silicone sealant are nonlinear, Nonlinear creep behavior is analyzed by means of the equivalence principle of time-stress, the main creep curve under reference stress was obtained by fitting with the viscoelastic rheological model. So the long-term creep behavior of the building silicone sealant under lower stress can be predicted by short-term creep behavior under higher stress.

scholarly journals Multi-Response Optimization of Tensile Creep Behavior of PLA 3D Printed Parts Using Categorical Response Surface Methodology

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2962
Author(s):  
Muhammad Waseem ◽  
Bashir Salah ◽  
Tufail Habib ◽  
Waqas Saleem ◽  
Muhammad Abas ◽  
...  
Keyword(s):  
Creep Rate ◽  
Creep Behavior ◽  
Fused Deposition Modeling ◽  
Three Dimensional ◽  
Rupture Time ◽  
Tensile Creep ◽  
Layer Height ◽  
Fused Deposition ◽  
Deposition Modeling ◽  
3D Printed

Three-dimensional printed plastic products developed through fused deposition modeling (FDM) endure long-term loading in most of the applications. The tensile creep behavior of such products is one of the imperative benchmarks to ensure dimensional stability under cyclic and dynamic loads. This research dealt with the optimization of the tensile creep behavior of 3D printed parts produced through fused deposition modeling (FDM) using polylactic acid (PLA) material. The geometry of creep test specimens follows the American Society for Testing and Materials (ASTM D2990) standards. Three-dimensional printing is performed on an open-source MakerBot desktop 3D printer. The Response Surface Methodology (RSM) is employed to predict the creep rate and rupture time by undertaking the layer height, infill percentage, and infill pattern type (linear, hexagonal, and diamond) as input process parameters. A total of 39 experimental runs were planned by means of a categorical central composite design. The analysis of variance (ANOVA) results revealed that the most influencing factors for creep rate were layer height, infill percentage, and infill patterns, whereas, for rupture time, infill pattern was found significant. The optimized levels obtained for both responses for hexagonal pattern were 0.1 mm layer height and 100% infill percentage. Some verification tests were performed to evaluate the effectiveness of the adopted RSM technique. The implemented research is believed to be a comprehensive guide for the additive manufacturing users to determine the optimum process parameters of FDM which influence the product creep rate and rupture time.

scholarly journals Study on the Creep Behaviors of Interactive Marine-Terrestrial Deposit Soils

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
Zhen Yan ◽  
Gang Li ◽  
Jinli Zhang ◽  
Rui Zhang
Keyword(s):  
Creep Behavior ◽  
Axial Strain ◽  
Nonlinear Creep ◽  
Creep Tests ◽  
Creep Equation ◽  
One Dimensional ◽  
Consolidation Pressure ◽  
Deviator Stress ◽  
Consolidation Coefficient ◽  
Triaxial Creep

The interactive marine-terrestrial (IMT) deposit soils were formed in the complex depositional environment; their mechanical properties are different from the other deposits. The creep behaviors of Dalian clayey soils were studied according to one-dimensional creep tests and drained triaxial creep tests. Based on the creep test results, the empirical model was established to describe the one-dimensional creep behavior and triaxial creep behavior, respectively. The results showed that Dalian deposits have typical nonlinear creep behavior. With the increasing of consolidation pressure, the strain is increased, the stability time is extended, and the demarcation point between primary and secondary consolidation is more obvious. The deposits belong to medium to high secondary compressibility soil, and the secondary consolidation coefficient is decreased with the increasing of consolidation time and increased with consolidation pressure increasing. The ratio between secondary consolidation coefficient and compression index at different depths changes from 0.033 to 0.058, which conform to Mesri conclusion. Under low deviator stress, the creep processes showed the characteristic of attenuation creep and shear contraction. However, it showed the characteristic of acceleration creep, shear contraction, and shear dilatancy under damage deviator stress. The axial strain rate decreased with the increasing of creep time and increased with the deviator stress increasing, while the deviator stress has little effect on the m values. The tests results agree well with the calculation results, which showed that the creep equation is suitable for describing the creep behaviors of Dalian interactive marine-terrestrial deposits.

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