Thermo-mechanical shock fracture analysis by meshless method

Memari, Amin; Azar, Mohammad Reza Khoshravan

doi:10.1016/j.tafmec.2019.04.013

Cited by 22 publications

(5 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thermal fracturing is a common phenomenon when a manmade structure under no confining stress subjects to a sudden and significant temperature change (Bahr et al, 2010;Greco et al, 2021;He et al, 2021;Memari and Khoshravan Azar, 2019;Wang et al, 2023) or a natural rock formation under subsurface stresses experiences significant cooling/heating by injected or flowing fluid (Barr, 1980;Enayatpour et al, 2019;Hu et al, 2021;Murphy, 1978;Wu et al, 2021;Yan et al, 2020). The propagation and arrest of thermal shock fractures under no confining stress have been studied experimentally, numerically and theoretically (Guo et al, 2018;Hofmann et al, 2011;Shao et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Coalescence of thermal fractures initiated at parallel cooling surfaces

Chen,

Zhou,

Wang

2023

View full text Add to dashboard Cite

PurposeThermal fractures initiated under cooling at the surfaces of a 2-D or 3-D structure propagate, arrest and coalesce, leading to its structural failure and material-property changes, while the same processes can happen in the rock mass between parallel hydraulic fractures filled with cold fluid, leading to enhanced fracture connectivity and permeability.Design/methodology/approachThis study used a 2-D plane strain fracture model for mixed-mode thermal fractures from two parallel cooling surfaces. Fracture propagation was governed by the theory of linear elastic fracture mechanics, while the displacement and temperature fields were discretized using the adaptive finite element method. This model was validated using two numerical benchmarks with strong fracture curvature and then used to simulate the propagation and coalescence of thermal fractures in a long rock mass.FindingsModeling results show two regimes: (1) thermal fractures from a cooling surface propagate and arrest by following the theoretical solutions of half-plane fractures before the unfractured portion decreases to 20% rock-mass width and (2) some pairs of fractures from the opposite cooling surfaces tend to eventually coalesce. The fracture coalescence time is in a power law with rock-mass width.Originality/valueThese findings are relevant to both subsurface engineering and material engineering: structure failure is a key concern in the latter, while fracture coalescence can enhance the connectivity of thermal and hydraulic fractures and thus reservoir permeability in the former.

show abstract

Section: Introductionmentioning

confidence: 99%

Coalescence of thermal fractures initiated at parallel cooling surfaces

Chen,

Zhou,

Wang

2023

View full text Add to dashboard Cite

show abstract

“…For example, the element-free Galerkin method (EFG) has been used in order to analyze plates under thermal and mechanical loads [5], to model the crack interactions under mechanical and thermal loads [6], and for the thermomechanical flow of friction stir welding processes [7]. The local Petrov-Galerkin method has been applied to study heat conduction with residual stress due to welding and thermomechanical shock fracture [8][9] whilst the Radial Point Interpolation Method (RPIM) has been used in thermoelastic problems with moving heat sources and thermomechanical crack growths [10][11]. Finally, the particle finite element method (PFEM) has been applied in thermomechanical problems such as chip formation and metal cutting problems [12][13].…”

Section: Introductionmentioning

confidence: 99%

A meshfree method for analysis of thermo-elastic problems with moving heat sources in welding

Saucedo-Zendejo

Cortes-Vargas

2022

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

This manuscript presents the development and application of a meshfree procedure based on the finite pointset methods for thermo-elastic problems with moving heat sources, which are present in welding processes. The meshfree nature of this formulation gives the advantage of dealing with geometrical distortions and even fragmentations without the need of using computationally expensive remeshing approaches with a very simple implementation. A description of the implementation of this method and the solutions of some numerical examples are presented in order to show the potential of this formulation for dealing with thermoelasticity problems with moving heat sources and to introduce promising future fields of application.

show abstract

“…Sudden changes in temperature can cause thermal stress and "catastrophic damage in the form of cracks so that the strength of the material is suddenly decreased" [14]. This process is referred to as thermal shock (TS) [14][15][16]. In addition, the rock mass suffers not only the static in-situ stress, but also the widespread stress adjustments, blasting loading, and excavation unloading during the excavation process [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Properties of Thermal Shock Treated Sandstone Subjected to Coupled Dynamic and Static Loads

Huang

Yin

et al. 2021

Minerals

View full text Add to dashboard Cite

In deep rock engineering, the rock mass can be subjected to thermal stress caused by sudden changes in temperature, which is referred to as thermal shock (TS). To study the effect of TS on heated sandstone, three cooling methods are used to provide different cooling rates. Then the coupled dynamic and static loading tests are carried out on the heated sandstone by means of a modified split Hopkinson pressure bar (SHPB) system. The test results show that as the heating level increases, the dry density, P-wave velocity, and the dynamic combined strength of the heated sandstone decrease, while specimen porosity increases. Particularly, a sharp change in the physical properties of sandstone can be observed at 650 °C, which is believed to be caused by the α-β transition of quartz at 573 °C. At each heating level of the test, the damage caused by the higher cooling rate to the heated sandstone is more than that caused by the lower cooling rate. The different failure modes of sandstone with increasing temperature are analyzed. The mechanism of TS acting on heated sandstone is discussed, and two typical fracture patterns reflecting the action of TS are identified through SEM.

show abstract

Thermo-mechanical shock fracture analysis by meshless method

Cited by 22 publications

References 43 publications

Coalescence of thermal fractures initiated at parallel cooling surfaces

Coalescence of thermal fractures initiated at parallel cooling surfaces

A meshfree method for analysis of thermo-elastic problems with moving heat sources in welding

Dynamic Properties of Thermal Shock Treated Sandstone Subjected to Coupled Dynamic and Static Loads

Contact Info

Product

Resources

About