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SUMMARY:The mechanical properties of wood at high rates of strain - Stephe
 n Walley\, PCS Group\, Cavendish Laboratory
DTSTART:20250501T140000Z
DTEND:20250501T150000Z
UID:TALK228430@talks.cam.ac.uk
CONTACT:Stephen Walley
DESCRIPTION:Due to its importance in the construction of ships\, wood was 
 one of the first substances to have the velocity dependence of its resista
 nce to impact quantified. This was achieved in England and France early in
  the 19th century. Techniques for measuring the high-rate mechanical prope
 rties of wood were developed around the start of the 20th century. These s
 tudies involved drop-weight and pendulum machines to quantify the dynamic 
 fracture toughness of timbers and were mostly performed by the US Forestry
  Service. It was not until 1977 that the first high-rate compression stres
 s-strain curves of wood were obtained using the Kolsky bar\, despite this 
 device having been developed in Britain in the 1940s. It took until the mi
 d-1990s and the desire to use wood to cushion the drop-impact of vessels u
 sed to transport dangerous waste that Kolsky bar studies of wood began in 
 earnest in Britain\, the Czech Republic and Russia. Even so\, to date fewe
 r than 100 such studies have been published compared to nearly 5\,000 for 
 metals. The seminar will summarize the effects of anisotropy\, stress stat
 e\, multiple repeat loading\, moisture content\, temperature\, and density
  on the high-rate properties of a wide range of woods. The seminar will fi
 nish with suggestions for what needs doing in the future. A review paper o
 n this topic has recently been published in 'Journal of Dynamic Behavior o
 f Materials'.
LOCATION:Seminar Room West\, Room A0.015\, Ray Dolby Centre\, Cavendish La
 boratory
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