Effect of mechanical loading history on fatigue crack growth of non-crystallizing rubber

Schieppati, Jacopo; Schrittesser, Bernd; Wondracek, Alfred; Robin, Stefan; Holzner, Armin; Pinter, Gerald

doi:10.1016/j.engfracmech.2021.108010

Cited by 10 publications

(6 citation statements)

References 33 publications

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“…In [10], a mathematical model was proposed that allows one to quantitatively assess the behavior of a rubber-like material during uniaxial and biaxial loading, as well as the effect of crystallization on the occurrence of cracks. According to [11], cracks in rubber that do not crystallize as a result of material fatigue do not significantly affect the change in its mechanical properties. Accordingly, doubts arise about the adequacy of the mathematical model proposed in [10].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…Thus, the material from which the PFH is made is composite, which significantly complicates the study of the influence of the nature of damage on the change in its mechanical properties. The overwhelming majority of the analyzed works [2][3][4][5][6][7][9][10][11] are devoted precisely to the study of the mechanical properties of various materials from which the PFH is structurally made. The assessment of the change in the mechanical properties of the PFH prototypes as a result of exposure to external influences was carried out only in [12][13][14].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

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Establishment of the dependence of the strength indicator of the composite material of pressure hoses on the character of single damages

Nazarenko

Kushnareva

Maslich

et al. 2021

EEJET

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Experimental studies are presented and the dependence of the change in the strength of the material of a pressure head fire hose of type T with an inner diameter of 77 mm in the longitudinal direction is established, taking into account single damages. The work describes the plan of the experiment and carried out a number of field experiments to determine the effect of the length ld and the depth K damage on the strength F of the hose material, that is, obtaining the dependence F=f (ld, K). A mathematical method of experiment planning was used and a plan was drawn up for a complete multivariate experiment of type 2k with an acceptable model accuracy of 5 %. The limits of variation of the factors are set taking into account a priori information, experimental capabilities and on the basis of the results of preliminary search experiments. The dependence in the coded and natural values of the factors is obtained. The reliability of the relationship was checked using the Fisher test, the calculated value of which was 5.98, which confirms the adequacy of the described process with a probability of 95 %. Analyzing experimental studies of the dependence of the change in the strength of the hose material on the length and depth of damage, it can be said that the change in the strength of the hose almost linearly depends on the specified damage parameters. It is found that with increasing damage, the strength of the hose material significantly decreases. When varying the length factor and the greatest depth of damage, K=0.4 mm, the strength of the hose material decreases from 11.67 kN to 8.77 kN, and in percentage terms by 25 %. The results obtained can be used in practical units of emergency rescue teams, when diagnosing hidden damage in pressure head fire hoses in order to prevent their failure in case of fires

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Establishment of the dependence of the strength indicator of the composite material of pressure hoses on the character of single damages

Nazarenko

Kushnareva

Maslich

et al. 2021

EEJET

View full text Add to dashboard Cite

show abstract

“…Then, the assessment of the critical defect size for fatigue failure was performed using the fracture mechanics approach. This was done by considering the material fatigue crack growth [ 34 ] and taking into account the effect of temperature [ 35 ]. The calculated critical defect size was then compared with the dimensions of defects present in the undamaged specimen, which was evaluated through a μ-CT analysis.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Analysis and Defect Size Evaluation of Filled NBR including Temperature Influence

et al. 2022

Self Cite

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The fatigue behavior of a filled non-crystallizing elastomer was investigated on axisymmetric dumbbell specimens. By plotting relevant Wöhler curves, a power law behavior was found. In addition, temperature increases due to heat build-up were monitored. In order to distinguish between initiation and crack growth regimes, hysteresis curves, secant and dynamic moduli, dissipated and stored energies, and normalized minimum and maximum forces were analyzed. Even though indications related to material damaging were observed, a clear trend to recognize the initiation was not evident. Further details were revealed by considering a fracture mechanics. The analysis of the fracture surfaces evidenced the presence of three regions, associated to initiation, fatigue striation, and catastrophic failure. Additional fatigue tests were performed with samples in which a radial notch was introduced. This resulted in a reduction in lifetime by four orders of magnitude; nevertheless, the fracture surfaces revealed similar failure mechanisms. A fracture mechanics approach, which considered the effect of temperature, was adopted to calculate the critical defect size for fatigue, which was found to be approximately 9 μm. This value was then compared with the particle size distribution obtained through X-ray microcomputed tomography (μ-CT) of undamaged samples and it was found that the majority of the initial defects were indeed smaller than the calculated one. Finally, the evaluation of J-integral for both unnotched and notched dumbbells enabled the assessment of a geometry-independent correlation with fatigue life.

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“…In TMF test, the utilization of induction coil for temperature heating to achieve a rapid temperature variation rate makes it difficult to measure the crack length because the specimen is surrounded by the coil. The most common crack growth measurement method is to take interval photos of the crack growth area through a charge coupled device (CCD) camera, by which the crack length data can be obtained directly 18–22 . However, the coil will block the lens field of view.…”

Section: Introductionmentioning

confidence: 99%

“…The most common crack growth measurement method is to take interval photos of the crack growth area through a charge coupled device (CCD) camera, by which the crack length data can be obtained directly. [18][19][20][21][22] However, the coil will block the lens field of view. Even if the crack propagation area is completely exposed by customizing special coils, the CCD camera must keep a sufficient distance to prevent the interfere of electromagnetic signals.…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical and isothermal fatigue crack propagation testing method for 316LN austenitic stainless steel

Zheng

Zhao

et al. 2022

Fatigue Fract Eng Mat Struct

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Investigating fatigue crack growth behavior of materials is crucial to the life design and safety evaluation of engineering structures. During the practical service condition, the temperature keeps changing, which cannot be studied by the traditional fatigue crack growth test method at constant temperature. In this study, we focus on constructing a new thermomechanical fatigue (TMF) crack propagation testing method, developing a thermal deformation compensation method, and proposing an equivalent compliance method suitable for variable temperature conditions based on ASTM E647 standard to measure the crack length. Furthermore, the load-and strain-controlled TMF tests under different phase angles are carried out to prove the validity of the new method.

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Effect of mechanical loading history on fatigue crack growth of non-crystallizing rubber

Cited by 10 publications

References 33 publications

Establishment of the dependence of the strength indicator of the composite material of pressure hoses on the character of single damages

Establishment of the dependence of the strength indicator of the composite material of pressure hoses on the character of single damages

Fatigue Analysis and Defect Size Evaluation of Filled NBR including Temperature Influence

Thermomechanical and isothermal fatigue crack propagation testing method for 316LN austenitic stainless steel

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