Investigating the Structural Dynamics and Crack Propagation Behavior under Uniform and Non-Uniform Temperature Conditions

Abstract

The robustness and stability of the system depend on structural integrity. This stability is, however, compromised by aging, wear and tear, overloads, and environmental factors. A study of vibration and fatigue cracking for structural health monitoring is one of the core research areas in recent times. In this paper, the structural dynamics and fatigue crack propagation behavior when subjected to thermal and mechanical loads were studied. It investigates the modal parameters of uncracked and various cracked specimens under uniform and non-uniform temperature conditions. The analytical model was validated by experimental and numerical approaches. The analysis was evaluated by considering different heating rates to attain the required temperatures. The heating rates were controlled by a proportional-integral-derivative (PID) temperature controller. It showed that a slow heating rate required an ample amount of time but more accurate results than quick heating. This suggested that the heating rate can cause variation in the structural response, especially at elevated temperatures. A small variation in modal parameters was also observed when the applied uniform temperatures were changed to non-uniform temperatures. This study substantiates the fatigue crack propagation behavior of pre-seeded cracks. The results show that propagated cracking depends on applied temperatures and associated mass. The appearance of double crack fronts and multiple cracks were observed. The appearance of multiple cracks seems to be due to the selection of the pre-seeded crack shape. Hence, the real cracks and pre-seeded cracks are distinct and need careful consideration in fatigue crack propagation analysis.

Comparative Analysis of Machine Learning Models for Predicting Crack Propagation under Coupled Load and Temperature

“…However, it is important to consider the nature of the different machine learning models and how they handle different types of problems. The research utilized experimental data from three materials collected from previous studies [20,21,23]. The experimental data consists of four features: temperature • C, crack location mm, amplitude mm, natural frequency Hz, and a predicted value: crack depth mm.…”

“…ABS, concrete, and aluminum are widely used materials in industries, such as automotive, construction, and aerospace. Understanding crack propagation in these materials is of practical significance for ensuring the reliability and durability of structures made from them [16][17][18][19][20][21][22][23]. By evaluating the performance of machine learning models on these materials, the study can provide insights and guidance for real-world applications, aiding in the design and maintenance of structures involving ABS, concrete, and aluminum.…”

Fracture Toughness Investigation of AL6082-T651 Alloy under Corrosive Environmental Conditions

“…Consequently, evaluating and testing fracture toughness has emerged as a crucial aspect in advancing the fracture mechanics approach and its engineering implementations. Standard terminology for fracture toughness testing and evaluation is specified by the American Society for Testing and Materials (ASTM) in E1823 and E399 [1][2][3]. A material's fracture toughness can also be affected by environmental factors such as humidity, temperature, and corrosion [4].…”

Strain Release Behaviour during Crack Growth of a Polymeric Beam under Elastic Loads for Self-Healing

“…Strain removal from an entire component could thus be initiated by any form of surface or subsurface damage. For strain removal to take place at a sub-surface level, the capsules could unfold and expand [ 13 , 14 ].…”