Xianfeng Yang

Beihang University | BUAA · Institute of Solid Mechanics

In order to study the energy absorption characteristics of the open-section thin-walled composite structures with different cross-sections, axial compression tests were carried out at loading speeds of 0.01 m/s, 0.1 m/s, and 1 m/s. Finite element models were built to predict the crushing response and energy absorption behaviors of these open-sectio...

Airplanes are inevitably subjected to various impact loading conditions in the event of emergency landing. An airplane crash scenario is a complex nonlinear impact event which involves large deformation, material fracture, structural failure, and dynamic contact. The impact response becomes more complicated due to the presence of composite material...

Designing innovative lightweight architected materials with enhanced mechanical properties and superior energy absorption is a long-term pursuit to protect against impact-induced damage. Compared with dense-walled lattices, innovative engineering designs indicate that hollow-walled lattices exhibit unprecedented combinations of mechanical propertie...

Designing innovative architected metamaterials with enhanced energy absorption is a long-term pursuit to provide impact protection capacity for human beings and crucial structural components. Numerous natural materials prove that hollow structures present unique combinations of mechanical properties and functionalities with minimal weight cost. The...

Non-invasive thermal therapy for subcutaneous tumors with the assistance of gold nanoparticles and surface cooling measures was proposed in the present study. To achieve real-time monitoring of 3-D temperature distribution and accurate measurement of thermal response, we developed a theoretical approach in which the dual-phase-lag (DPL) biological...

High-velocity impact on fluid-filled structures has become an increasingly critical issue for the vulnerability of aircraft fuel tanks. Hydrodynamic Ram (HRAM) is a typical phenomenon that occurs when a flying object impacts against a fluid-filled tank with a high velocity, leading to excessive structural damage and catastrophic failure. Thus, an e...

Laminated composites are extensively employed in many aerospace structures due to their excellent mechanical properties. In this paper, a size-dependent model on the basis of the nonlocal strain gradient theory is adopted to reveal the vibration behavior of laminated nanoplate with piezo-magnetic face sheets in its upper and lower surfaces. The gov...

Nano-assisted thermotherapy is an efficient method for subcutaneous tumors. However, an accurate prediction of the real-time temperature distribution and thermal damage during this thermotherapy process is still unachievable through non-invasive monitor. The present study proposed a theoretical method to predict the temperature distribution and bur...

Due to inherently mechanical behavior, the long porous structures may inevitably result in global buckling under compression, which is adverse to absorbing the impact energy. To make the material completely crushing, this paper proposes a novel detachable chain tensile energy absorber (DCTEA) inspired by mortise and tenon joint, which consists of c...

The dactyls of Odontodactylus scyllarus have been proved to be an exceptionally damage-tolerant natural material that can readily smash mollusk shells, crab exoskeletons or other hard-shelled preys. In the present study, inspired by the microstructural features of the impact region in the dactyl of Odontodactylus scyllarus, a novel lightweight bi-d...

Thermal ablation is an efficient method of medical treatment, such as cancer therapy, wound closure, laser cutting, freckle removal and other treatments. In order to guarantee the curative effect and the safety of the patients, the thermal response of the tissue which is subjected to the heat source need to be carefully monitored. However, it is to...

Recently, the graphene platelets (GPLs) are extensively used as reinforcements to enhance the strength of porous materials. However, most studies are focused on the straight GPLs-reinforced structures under macro-scale. In this paper, the thermo-mechanical vibration of a curved functionally graded (FG) porous nanobeam reinforced with GPLs is studie...

By utilizing the technology of surface nanocrystallization, the distribution of mechanical properties on metal structures can be changed. In this paper, a theoretical study is presented to investigate the large plastic deformation and energy absorption behavior of circular rings with locally nanocrystallized segments crushed between two rigid, flat...

By introducing local surface nano-crystallization, a novel strategy is proposed to controllably improve the energy absorption performance of thin-walled structures. A preliminary attempt is made to conduct the crashworthy design for hexagonal structures and several nano-crystallization design schemes are implemented. A large plastic deformation mod...

Helicopters are versatile aircraft that can perform numerous missions such as ground surveillance, rescue missions, air ambulance, fire-fighting etc. However, helicopter crashes sometimes occur owing to technical failures or human errors. Accordingly, the crashworthy design of helicopters has always remained a top priority to prevent catastrophic s...

The thermal damage of a three-dimensional bio-tissue model irradiated by a movable laser beam was studied in this work. By employing the DPL biological heat conduction model and Henriques’ thermal damage assessment model, the distribution of burn damage of vivo human tissue during laser therapy was analytically obtained. The influences of laser mov...

Honeycomb structures have attracted much attention in various engineering fields due to its superiorities in high specific strength, high specific stiffness and excellent energy-absorbing characteristics. The light-weight materials with exceptional mechanical behaviors can be achieved by incorporating the reinforced mesostructure into the regular h...

Laser ablation is an efficient technique of thermal treatment for tumor, during which process, temperature of the tumor tissue will be elevated by the laser beam. Irreversible burn and thermal deformation appear in the tissue, which can induce the protein denaturation and cell membrane looseness to kill the cancer cells. In order to investigate the...

The force-displacement curve of circular tubes under lateral crushing load is typically divided into three stages. However, the plateau force actually shows a linearly increasing trend under compression load. As a matter of fact, a stable plateau force is remarkably important for the energy absorption devices. In an effort to overcome this drawback...

This paper is focused on the dynamic mechanical behavior and failure characteristics of Ti-6AL-4V hi-lock bolt (HLB) under combined tensile-shear loading. Firstly, the dynamic mechanical properties of Ti-6AL-4V alloy under the quasi-static, intermediate strain rate and high strain rate are investigated by using an electronic universal testing machi...

The hyperthermia is an efficient technique for tumor treatment, in which the tumor is subjected to a heating source, such as laser, supersonic or electromagnetic field. In order to improve the therapeutic efficiency and to protect the surrounding healthy tissues, gold nanoshells are embedded in the tumor as the additive to make it absorb more therm...

Thermoelastic damping (TED) can lead to energy loss in microscale resonators, which is an intrinsic mechanism. To minimize the energy loss, it is required to determine the TED of resonators. Laminated plate resonators are commonly used in practice. However, existing researches on TED of the laminated resonators use mainly the one-dimensional (1D) h...

A novel triangular tube reinforced corrugated honeycomb, which is professionally termed as ripplecomb, is proposed by integrating triangular tubes with sine-wave corrugated plates to construct a quasi-hexagon honeycomb structure. The mechanical performance of ripplecomb under quasi-static out-of-plane uniform compression is investigated based on th...

The thermoelastic dynamic response of a clamped Bernoulli beam was studied when it was irradiated by a movable, temporally non-Gaussian, laser pulse. Both the energy absorption depth and the time decaying effects were considered. The temperature distribution, deflection, vibration acceleration, and stress of the beam were derived analytically, and...

At present, laser plays an important role in biomedical treatments and surgical techniques. To guarantee patients’ safety, a deeply understanding of thermal responses of biological tissues during laser-tissue interaction is required. The existing analytical researches usually explore the bio-thermal process based on a one-dimensional heat conductio...

Numerous composite structures with excellent integrative performance that can replicate the mechanical properties of biological materials have been created to fill gaps in material-property charts, and these bio-inspired structures have crucial implications in a wide range of engineering communities. In this paper, a series of novel bio-inspired al...

To investigate head-brain injuries caused by windshield impact on riders using electric self-balancing scooters (ESS). Numerical vehicle ESS crash scenarios are constructed by combining the finite element (FE) vehicle model and multibody scooter/rider models. Impact kinematic postures of the head-windshield contact under various impact conditions a...

The concept of mimicking natural materials to design novel lightweight structures with high capacity of energy absorption is of great interest at present. Enormous natural structures exhibit fascinating mechanical performance after hundreds of millions of years of convergent evolution. Odontodactylus scyllarus, known as the peacock mantis shrimp, w...

Polyvinyl butyral-laminated glass has been extensively applied to automotive windshields to reduce the severity of head injuries resulting from pedestrian–vehicle crashes. Thus, designing an optimized pedestrian protection design for laminated windshields (LWs) has become a priority. In this study, finite element models that describe LWs, headform,...

This paper studies the thermoelastic dynamic response of a simply supported beam under movable temporally non-Gaussian laser pulse. The heat conduction equation of the problem was solved by using the method of separation of variables. The Green’s function for the forth-order partial differential equation was derived and was used to solve the vibrat...

Takeoff and landing overruns account for most of the accidents that occur on or in the immediate vicinity of the runway, and it would cause accidental aircraft damage and loss of life. The current Engineered Material Arresting System (EMAS) materials are weak in water resistance and durability, expensive in acquiring and installing, and have negati...

The engineering material arresting system (EMAS) has been widely employed in airports around the world for purpose of stopping the overrun airplanes from damage. However, the foamed concrete, which is used as the EMAS core at present, has drawn increasing criticism from the public opinion for environmental issue and ageing problem. In this paper, a...

Aircrafts may overrun the runway during take-off and landing, leading to a catastrophe involving aircraft damage and even loss of life. In order to protect aircrafts and crews from casualty, a gradient engineering material arresting system (GEMAS) was developed to arrest the overrun aircrafts with different size in comparatively short distances sec...

The crashworthiness of helicopter fuel tank is vital to the survivability of the passengers and structures. In order to understand and improve the crashworthiness of the soft fuel tank of helicopter during the crash, this paper investigated the dynamic behavior of the nylon woven fabric composite fuel tank striking on the ground. A fluid–structure...