Article
Materials Science, Multidisciplinary
Alexander Dumansky, Elizaveta Klyatskina, Mukhamiat Alimov, Francisco Segovia, Alejandro Sanchez
Summary: This research proposes a modeling of time-dependent properties of unidirectional fiber reinforced plastics based on the structural mechanics of composite materials and mechanics of hereditary media. The constitutive equations of unidirectional fiber reinforced plastics have been derived using the Volterra correspondence principle and the algebraic properties of resolvent operators. Additionally, modeling of viscoelastic properties of a unidirectional composite material based on EDT-10 epoxy resin has been demonstrated.
Article
Mechanics
Shaoqiang Yao, Hui Cai, Aizhong Lu
Summary: In this study, a viscoelastic analytical solution for the axial forces of a deeply buried circular tunnel supported with point-anchored rock bolts was presented. The solution process considered the surrounding rock as both an elastic and a viscoelastic material. The results were compared with numerical methods and the effects of various factors on the axial forces of the rock bolts were discussed.
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
(2023)
Article
Engineering, Geological
Rong Zhao, Chunguang Li
Summary: This study presents a new relation model to describe the simultaneous dependence of dilation angle on the internal variable and the minimum principal stress for rocks. The model has been validated and shows good agreement with experimental results.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Engineering, Geological
Sabrina C. Y. Ip, Ronaldo I. Borja
Summary: The mechanical properties of clay rocks evolve with the degree of saturation, leading to changes in stiffness and strength anisotropy. Numerical models that capture the evolving elastic and plastic anisotropy with saturation are required for accurate predictions. The study presents an anisotropy framework for coupled solid deformation-fluid flow in unsaturated elastoplastic media, demonstrating the role of evolving stiffness and strength anisotropy in the mechanical behavior of clay rocks.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2022)
Article
Engineering, Geological
Sabrina C. Y. Ip, Ronaldo I. I. Borja
Summary: The microstructure of clay rocks is anisotropic, and the interactions between anisotropy at different scales can give rise to emerging properties. This study develops a homogenization model to capture the multiscale interactions of elastic anisotropy in unsaturated clay rocks. The model provides a quantitative link between anisotropy at multiple scales in clay rocks and its macroscopic anisotropic stiffness.
Article
Engineering, Mechanical
J. Garzon, C. S. Ramos, M. H. C. Bento, S. P. B. Proenca, C. A. Duarte
Summary: This paper presents a methodology for efficient analysis of 3-D fracture mechanics problems in linear viscoelastic media. The method combines the Elastic-Viscoelastic Correspondence Principle (EVCP), a Generalized Finite Element Method (GFEM), and an inverse Laplace transform (ILT) to compute Energy Release Rate (ERR) and Crack Mouth Opening Displacement (CMOD) for viscoelastic fracture problems in the time domain. The proposed method, EVCP-GFEM-ILT, requires only a single elastic solution regardless of the time interval of the target viscoelastic problem. Verification against analytical and reference numerical solutions is performed, and the computational cost is compared with a commercial software. The applicability of the proposed methodology is demonstrated through solving a fully 3-D mixed-mode fracture problem with a non-trivial viscoelastic material model, as well as a large-scale practical simulation problem.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Geosciences, Multidisciplinary
Bo-Ye Fu, Li-Yun Fu, Tongcheng Han, Chenghao Cao
Summary: Research shows that rough crack surfaces can affect the elastic stiffness of cracked rocks and decrease their stiffness. In fluid-saturated samples, stress concentration around the crack can affect the contribution of filling materials, rendering Gassmann equation and C&S equation invalid.
FRONTIERS IN EARTH SCIENCE
(2021)
Review
Energy & Fuels
Usama Alameedy, Ahmed Fatah, Ahmed K. Abbas, Ahmed Al-Yaseri
Summary: Acid treatment is widely used in the petroleum industry to stimulate carbonate formations. However, the generated wormholes can cause degradation in the mechanical properties of rocks, which is a key issue. Therefore, careful monitoring of the acidizing procedure and post-treatment evaluation of the rocks are crucial for matrix acidizing.
Article
Engineering, Geological
Xuhai Tang, Jingjing Xu, Yiheng Zhang, Haifeng Zhao, Adriana Paluszny, Xue Wan, Zhengzhi Wang
Summary: In the future, geotechnical engineering will be essential for human activities in space, such as asteroid mining. However, obtaining rock samples for testing from space missions is challenging due to their rarity and irregular shapes. Microscale Rock Mechanics Experiments (micro-RME) are being used to determine the macroscale Young's modulus of these samples. This study compared different upscaling methods and found that the Accurate Grain-Based Model (AGBM) was the most accurate. The AGBM was then used to estimate the mechanical properties and macroscale Young's modulus of a specific asteroid meteorite.
ENGINEERING GEOLOGY
(2023)
Article
Construction & Building Technology
Santosh Reddy Kommidi, Yong-Rak Kim
Summary: This study investigated the feasibility of using dynamic shear rheometer (DSR) to characterize the low temperature behavior of binders. By converting DSR test results to BBR beam deflection and improving prediction methods, it was demonstrated that DSR testing can be a good supplemental or alternative method to BBR.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Physics, Multidisciplinary
Juan A. Canas, J. Bernal, A. Martin-Ruiz
Summary: In this paper, a systematic approach to determine the classical limit of periodic quantum systems is developed and successfully applied to the problem of the quantum bouncer. It is found that, in the limit of large quantum numbers, the classical probability density does not follow the quantum probability density and can be recovered through local averaging.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Mathematics, Applied
Kotaro Miura, Chihiro Oyama, Makoto Sakamoto, Yuji Tanabe
Summary: This study utilized relaxation indentation tests and analytical solutions to evaluate the viscoelastic parameters of different materials, finding that the five-element model is more suitable for describing the materials' relaxation behavior. Additionally, the viscoelastic parameters of treated articular cartilage significantly decreased, providing a tool for assessing cartilage degeneration.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2021)
Article
Mechanics
Jan Sladek, Vladimir Sladek, Xinpeng Tian, Qian Deng
Summary: The correspondence principle is applied to solve general 2-D electro-viscoelastic problems with the flexoelectric effect, using a mixed finite element method. Competitive characteristics of strengthening and softening in micro/nano-sized structures are considered. The standard finite element method cannot be directly applied due to higher order derivatives, hence a mixed FEM approach is developed and successfully demonstrated through example problems.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Engineering, Geological
Xiangsheng Chen, Yinping Li, Lihong Tong, Daxin Geng, Zhikai Dong, Peiliang Yang
Summary: Experimental results suggest that the deformation and strength of rocks are heavily influenced by the damage suffered during loading. Traditional constitutive models fail to accurately describe the non-linear deformation behaviors of rocks. To address this limitation, a new elastoplastic damage constitutive model is proposed, taking into account the competition between damage and strain hardening or softening during rock compression. The model is validated through finite element programming and triaxial compression tests. Comparison with experimental data shows that the model effectively captures the stress-strain curves and damage-strain curves of rocks, particularly the phenomenon of softening, hardening, and residual strength. Parametric analysis reveals the impact of confining pressure, scale parameter, and shape parameter on rock damage. The results demonstrate that rock properties significantly affect strength and deformation, which are closely tied to stress-induced damage and strain characteristics.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Thermodynamics
Chin Hsuan Su, Chyanbin Hwu, Van Thuong Nguyen
Summary: This study focuses on the transient thermal stress analysis of materials that are anisotropic, viscoelastic, and thermorheologically simple, utilizing the complex variable Stroh formalism, elastic-viscoelastic correspondence principle, and time-temperature superposition principle. The combined use of these theories allows for the analysis of transient anisotropic thermo-viscoelasticity problems, leading to the development of two novel boundary element methods for accurate solutions.
JOURNAL OF THERMAL STRESSES
(2021)
Article
Engineering, Civil
Shashank Bhatra, Priti Maheshwari
KSCE JOURNAL OF CIVIL ENGINEERING
(2019)
Article
Engineering, Geological
Priti Maheshwari, Bhargav Sai Naramsetti
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2019)
Article
Geosciences, Multidisciplinary
Priti Maheshwari, Prabir Kumar Basudhar
ARABIAN JOURNAL OF GEOSCIENCES
(2020)
Article
Engineering, Civil
Priti Maheshwari, Nitish Kumar Yadav, Jagdish Prasad Sahoo
KSCE JOURNAL OF CIVIL ENGINEERING
(2020)
Article
Mechanics
Kirtika Samanta, Priti Maheshwari
Summary: In this study, a machine foundation system subjected to harmonic and pulse loading is analyzed by modeling it as a linear elastic-perfectly plastic single degree of freedom (SDOF) system. The response of the SDOF system under the combined action of harmonic and pulse loading is obtained in the form of displacement-time plots. It is found that the negative phase of the pulse loading significantly influences the displacement of the SDOF system and should not be neglected by idealizing the explosion with a triangular pulse loading.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Engineering, Geological
Priti Maheshwari, Sujeet Yadav
Summary: In this study, the analysis of a hammer foundation subjected to combined action of rectangular pulse and exponential pulse excitation with negative phase in an event of explosion is conducted. The foundation is modeled as an elastic single degree of freedom system, and four different analysis cases are considered. Closed-form solutions are derived for the underdamped system, taking into account the interaction between rectangular pulse and exponential pulse. A parametric study is carried out to investigate the influence of various input parameters on the system's time-displacement history. The study finds application in the design of hammer foundations under simultaneous impact and exponential pulse excitations.
INDIAN GEOTECHNICAL JOURNAL
(2022)
Article
Engineering, Geological
Kirtika Samanta, Priti Maheshwari
Summary: This investigation analyzes the time-displacement response of foundations under combined harmonic and pulse loadings, taking into account the hardening and softening behavior. Two analysis cases are considered based on the time of pulse loading application and the occurrence of maximum deflection. Solutions for the underdamped system are obtained using a semi-analytical approach. The study examines the combined action of the two different loadings and conducts a detailed parametric study to understand the influence of various parameters on the time-displacement history of the system. The results show that the interaction due to the combined action of harmonic and pulse loading should not be neglected.
INTERNATIONAL JOURNAL OF GEOTECHNICAL ENGINEERING
(2023)
Article
Engineering, Civil
Anita Bhatt, Priti Maheshwari, Pradeep Bhargava
Summary: This study presents a probabilistic analysis of a single degree of freedom (SDOF) system subjected to drift-controlled distant blast loading. It finds that the ESF factor and the resistance of the SDOF system are highly sensitive to different parameters and follow a log-normal distribution. The study suggests that the probabilistic analysis is more conservative than the deterministic analysis and can be incorporated into a deterministic approach with suitable factor of safety.
INTERNATIONAL JOURNAL OF PROTECTIVE STRUCTURES
(2022)
Article
Engineering, Civil
Kirtika Samanta, Priti Maheshwari
Summary: The behavior of machine foundations under harmonic loading with varying frequency and pulse loading is studied in this research. Due to excessive vibrations from the pulse loading, the machine undergoes an emergency shutdown where the exciting frequency decreases exponentially to zero. The study considers an elastic plastic single degree of freedom system with hardening and softening behavior, and analyzes two cases depending on the time of pulse loading application. The governing equations of motion are obtained and numerically solved using the fourth order Runge-Kutta method, providing displacement-time graphs for various parameters to investigate their influence on the machine-foundation system's behavior. This study helps in predicting the dynamic response of foundations under emergency shutdown conditions caused by pulse loading, and aids in decision-making regarding the need for vibration barriers to maintain displacements within permissible limits.
INTERNATIONAL JOURNAL OF PROTECTIVE STRUCTURES
(2023)
Article
Engineering, Geological
Priti Maheshwari
Summary: This study uses Monte Carlo simulations to analyze shallow excavations in linear viscoelastic laminated rocks, assuming that only one roof rock layer participates in the deformation of the excavation. Two viscoelastic models, namely Kelvin model and Burgers' model, are considered to represent the roof rock layer. The uncertainty in the time-dependent characteristics of the roof rock layer is represented by a random variable called retardation time, which follows a log-normal distribution. The realizations of retardation time are used in a deterministic model to obtain the realizations of maximum deflection of the roof rock layer. These realizations are further analyzed to study the probability distribution functions (PDF) with varying coefficient of variation (COV) values. The PDFs are then used to correlate factors of safety (FOS) with COV and risk levels, and an approximate relationship is obtained as FOS≈aε(-b), where the parameters a and b increase with increasing COV values. Tabulated values of calculated FOS versus COV are given for specific risk levels. It is recommended to consider the COV of uncertain rock parameters and allowable risk in the design of such excavations and adopt a rational factor of safety.
INDIAN GEOTECHNICAL JOURNAL
(2023)
Article
Engineering, Geological
Shashank Bhatra, Priti Maheshwari
Summary: This study investigates the response of rails on geocell-stone column improved tensionless foundations to adjacent axle loads and inclusion of stone columns through mathematical modeling and analysis. The sensitivity of input parameters of the soil-foundation system on the response of the rail is studied in detail and presented in the form of non-dimensional charts.
GEOTECHNICAL AND GEOLOGICAL ENGINEERING
(2021)
Article
Engineering, Geological
Pavani Murakonda, Priti Maheshwari
GEOTECHNICAL AND GEOLOGICAL ENGINEERING
(2020)
Proceedings Paper
Engineering, Civil
Priti Maheshwari
GEOTECHNICAL APPLICATIONS, VOL 4
(2019)
Article
Engineering, Geological
Pavani Murakonda, Priti Maheshwari
INDIAN GEOTECHNICAL JOURNAL
(2019)