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Topic

Impact

About: Impact is a research topic. Over the lifetime, 2845 publications have been published within this topic receiving 30037 citations.


Papers
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Journal ArticleDOI
TL;DR: In this article, the impact damage of composite laminates in the form of intra-and inter-laminar cracking was modelled using stress-based criteria for damage initiation, and fracture mechanics techniques to capture its evolution.

476 citations

Journal ArticleDOI
TL;DR: In this paper, the impact response of structural composites to impact cannot be overstated and the need for instrumented testing to optimize our understanding of the impact event, especially the response of the impacted material is presented.
Abstract: The importance of understanding the response of structural composites to impact cannot be overstated. This understanding includes both the impact phenomena themselves and the influence of materials properties on the impact response. This paper presents the need for instrumented testing to optimize our understanding of the impact event, especially the response of the impacted material. The conclusion is drawn that the impact force history is a more relevant measure of a materials characteristics than is the total kinetic energy of the impactor. Static and dynamic impact phenomena are assessed to lay the foundation for the eventual development of a standardized test method focused on the lower velocity range impact response behavior of composites. In addition, a relatively inexpensive but very versatile low-velocity, instrumented pendulum impact tester is described and actual test data for both graphite fiber/thermoset matrix and graphite fiber/thermoplastic matrix are compared. Actual energy absorption cur...

400 citations

Journal ArticleDOI
TL;DR: The result showed that running velocity does influence external impact force peaks (linear connection) and that midsole hardness does not influence magnitude and loading rate of the external vertical impact forces.

367 citations

Patent
20 Nov 2006
TL;DR: In this paper, a pile driving control apparatus for a pile-driving system includes a hydraulic control system that controls a throttle of a pile driven hammer, and thereby controls an impact velocity of the hammer with a pile.
Abstract: A pile driving control apparatus for a pile driving system includes a hydraulic control system that controls a throttle of a pile driving hammer, and thereby controls an impact velocity of the hammer with a pile. A controller provides a control signal to the hydraulic control system. Based on the control signal, the hydraulic control system controls an impact velocity of the hammer during a subsequent hammer stroke. The controller may determine one or more control parameters such as sound pressure at a sound control location during a hammer stroke, vibration at a vibration control location during a hammer stroke, an impact force imparted to the pile during a hammer stroke, and/or actual pile capacity of the pile, and provide to the hydraulic control system a control signal based on the determined control parameter(s).

366 citations

Journal ArticleDOI
TL;DR: In this article, the characterization of composite material suitable for constructing structural parts devoted to dissipate kinetic energy during impacts is discussed. But the impact behavior of the material is not investigated.

313 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202375
2022149
202198
2020166
2019169
2018184