tag:blogger.com,1999:blog-8110476246806509018.post3509285212208685230..comments2024-03-07T19:48:21.526+00:00Comments on Earth Learning Idea: Testing the strength of rocks - bouncing backEarth Learning Ideahttp://www.blogger.com/profile/09306943777031289955noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-8110476246806509018.post-22831540787594285622013-02-13T16:30:38.545+00:002013-02-13T16:30:38.545+00:00Explanations have been written in the 'Underly...Explanations have been written in the 'Underlying principles' within the activity, as follows:-<br /><i>There is a statistical correlation between bounce height and rock strength. “Rock strength”, as used here, is a shortened version of “the uniaxial compressive strength of a rock”, measured in megapascals. Engineers would use equipment such as a Schmidt Hammer, (see photograph), which uses a rebound measurement to obtain the uniaxial compressive strength.</i><br />An elastic material has the ability to recover strain without loss of energy, i.e. the stress/strain curve is followed downwards when stress is reduced. Again, there is a good statistical relationship between elasticity as defined above and material strength.Earth Learning Ideahttps://www.blogger.com/profile/09306943777031289955noreply@blogger.comtag:blogger.com,1999:blog-8110476246806509018.post-46767308634539222212013-02-12T19:05:14.929+00:002013-02-12T19:05:14.929+00:00Not strength. At least not until the impact is hi...Not strength. At least not until the impact is high-enough energy to actually deform plastically or fracture grains or grain interfaces.<br />Elasticity, of the several modes of elastic deformation, is the 'bounce' in the impactor.Anonymoushttps://www.blogger.com/profile/09827729854421438793noreply@blogger.com