公开(公告)号：US20080276720A1

公开(公告)日：2008-11-13

申请号：US11573803

申请日：2005-08-19

Applicant: Ian Chalmers

Inventor： Ian Chalmers

IPC: G01N3/22

CPC classification number: G01N33/346 ,  G01N3/32 ,  G01N2203/0021 ,  G01N2203/0083

Abstract: A method and apparatus for testing shear stiffness in board is disclosed. The board sample (6) is placed into stationary jaw (2) and jaw (3) which is rigidly connected to inertial mass (7). The mass (7) is twisted around the sample axis with an initial twist chosen to ensure the sample is within the elastic region, and then allowed to freely oscillate. The oscillation frequency is then measured to evaluate the torsional stiffness of the sample.

Abstract translation: 公开了一种用于测试板中剪切刚度的方法和装置。 板样品（6）放置在刚性连接到惯性质量（7）的静止颚板（2）和颚板（3）中。 质量（7）围绕样品轴线扭曲，初始扭曲被选择以确保样品在弹性区域内，然后允许自由振荡。 然后测量振荡频率以评估样品的扭转刚度。

公开(公告)号：US07621187B2

公开(公告)日：2009-11-24

申请号：US11573803

申请日：2005-08-19

Applicant: Ian Chalmers

Inventor： Ian Chalmers

IPC: G01N3/22

CPC classification number: G01N33/346 ,  G01N3/32 ,  G01N2203/0021 ,  G01N2203/0083

Abstract: A method and apparatus for testing shear stiffness in board is disclosed. The board sample (6) is placed into stationary jaw (2) and jaw (3) which is rigidly connected to inertial mass (7). The mass (7) is twisted around the sample axis with an initial twist chosen to ensure the sample is within the elastic region, and then allowed to freely oscillate. The oscillation frequency is then measured to evaluate the torsional stiffness of the sample.

Abstract translation: 公开了一种用于测试板中剪切刚度的方法和装置。 板样品（6）放置在刚性连接到惯性质量（7）的静止颚板（2）和颚板（3）中。 质量（7）围绕样品轴线扭曲，初始扭曲被选择以确保样品在弹性区域内，然后允许自由振荡。 然后测量振荡频率以评估样品的扭转刚度。