scholarly journals Dynamic behaviour of an earthen material under different impact loading conditions

2018 ◽  
Vol 183 ◽  
pp. 02014
Author(s):  
Luigi Fenu ◽  
Francesco Aymerich ◽  
Luca Francesconi ◽  
Daniele Forni ◽  
Nicoletta Tesio ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Impact Loading ◽  
Dynamic Behaviour ◽  
Hopkinson Bar ◽  
Impact Response ◽  
Favourable Effect ◽  
Impact Loads ◽  
Response Curves ◽  
Hemp Fibres ◽  
Modified Hopkinson Bar

The dynamic behaviour of earthen materials reinforced with natural fibres is little studied although earth buildings are often built in seismic areas. In this paper the dynamic behaviour of an earthen material reinforced with hemp fibres under different impact loadings has been experimentally investigated. The dynamic response of the material in 3-point bending was investigated through an instrumented dropweight device, while the response in tension and in compression was investigated through a modified Hopkinson bar device. Typical impact response curves for tension, compression and bending impact tests have been obtained. The favourable effect of fibres in dissipating fracture energy under impact loads has been observed in all these types of test.

scholarly journals Dynamic impact response of lithium-ion batteries, constitutive properties and failure model

RSC Advances ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 2464-2473 ◽  
Author(s):  
Golriz Kermani ◽  
Elham Sahraei
Keyword(s):  
Dynamic Response ◽  
Lithium Ion Batteries ◽  
Impact Loading ◽  
Lithium Ion ◽  
Impact Response ◽  
Failure Model ◽  
Dynamic Impact ◽  
Constitutive Properties

Dynamic response and failure of pouch and elliptical cells under impact loading.

Steady-State Dynamic Response of a Limited Slip System

1968 ◽  
Vol 35 (2) ◽  
pp. 322-326 ◽  
Author(s):  
W. D. Iwan
Keyword(s):  
Steady State ◽  
Dynamic Response ◽  
Slip System ◽  
External Load ◽  
Initial Conditions ◽  
Viscous Damping ◽  
Steady State Response ◽  
Response Curves ◽  
State Response ◽  
System Nonlinearity

The steady-state response of a system constrained by a limited slip joint and excited by a trigonometrically varying external load is discussed. It is shown that the system may possess such features as disconnected response curves and jumps in response depending on the strength of the system nonlinearity, the level of excitation, the amount of viscous damping, and the initial conditions of the system.

The Dynamic Response of a Simple Elastic System to Antisymmetric Forcing Functions Characteristic of Airplanes in Unsymmetric Landing Impact

1949 ◽  
Vol 16 (3) ◽  
pp. 310-316
Author(s):  
Joseph B. Woodson
Keyword(s):  
Dynamic Response ◽  
Sine Wave ◽  
Response Curves ◽  
Response Factors ◽  
Natural Period ◽  
Wave Pulse ◽  
Pulse Disturbance ◽  
Landing Impact ◽  
Forcing Functions ◽  
The Difference

Abstract This paper presents an analysis of the dynamic response of an undamped mechanical system with one degree of freedom subjected to disturbances which are described by antisymmetric forcing functions. The analysis was undertaken to throw light on the effect on the vibration of the wings caused by unsymmetric landing impact of an airplane. Two types of disturbances are considered; a full-sine-wave pulse, and a pulse which is the difference between two overlapping half sine waves. The results are presented in the form of dynamic-response curves and dynamic-response-factor curves. The numerically greatest dynamic-response factors, approximately 3.24 and −3.26, resulted for a full-sine-wave pulse disturbance with a ratio of duration of impact to natural period, Ti/T ≅ 1.11. When Ti/T is in the neighborhood of 1, the first positive peak of dynamic response is numerically less than the negative and positive peaks which follow it. For much of the range, the positive and negative dynamic-response factors are numerically approximately equal. The analysis was confined to values of Ti/T between 0.33 and 12. As Ti/T increases without limit, the positive and negative dynamic-response factors tend to 1 and −1, respectively.

Dynamic response of internally nested hemispherical shell system to impact loading

2017 ◽  
Vol 120 ◽  
pp. 29-37 ◽  
Author(s):  
Jianxing Hu ◽  
Guoyun Lu ◽  
Huiwei Yang ◽  
T.X. Yu ◽  
Jun Xu
Keyword(s):  
Dynamic Response ◽  
Impact Loading ◽  
Shell System ◽  
Hemispherical Shell

Dynamic Impact Measurements on Crossings, in Free Floating and In-Situ Conditions

2014 ◽  
Author(s):  
M. A. Boogaard ◽  
A. L. Schwab ◽  
Z. Li
Keyword(s):  
Finite Element ◽  
Condition Monitoring ◽  
Impact Loading ◽  
Dynamic Behaviour ◽  
Element Model ◽  
Mode Shapes ◽  
Dynamic Impact ◽  
In Situ Test ◽  
In Situ Conditions

As vibration based condition monitoring requires a good understanding of the dynamic behaviour of the structure, a good model is needed. At the TU Delft a train borne monitoring system is being developed which currently focusses on crossings. Crossings are prone to very fast degradation due to impact loading. In this paper a finite element model of a free floating frog is presented and validated up to a 100 Hz using dynamic impact measurements. The mode shapes of the free floating frog are then also compared to some preliminary results from an in-situ test. This comparison shows that the in-situ frequencies can be up to twice the free floating frequency.

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