Provided is a system for measuring rigidity characteristics that measures a CT value of a golf club head based on an acceleration occurring in an impactor when the impactor is caused to strike the golf club head. Correlation data is calculated by measuring a representative CT value of the golf club head, which is calculated based on CT values measured multiple times by changing the impact velocity of the impactor, and a test velocity CT value, which is a CT value when the impact velocity is set to a predetermined test velocity, for each of a plurality of the golf club heads of an identical model. A rigidity characteristic value measuring device measures the test velocity CT value for another golf club head of the model. A computer estimates the representative CT value of the other golf club head based on the test velocity CT value and the correlation data.

Provided is a rigidity characteristics measuring device that measures the rigidity characteristics of a golf club head. A head fixing jig holds the golf club head with a face surface facing upward. A linear bushing causes an impact rod to drop vertically toward the golf club head. The impact rod is equipped with an acceleration sensor. A computer calculates the rigidity characteristics, e.g., a CT value, of the golf club head, based on a detected value of the acceleration sensor.

Provided is a rigidity characteristics measuring device that measures the rigidity characteristics of a golf club head. A head fixing jig holds the golf club head with a face surface facing upward. A linear bushing causes an impact rod to drop vertically toward the golf club head. The impact rod is equipped with an acceleration sensor. A computer calculates the rigidity characteristics, e.g., a CT value, of the golf club head, based on a detected value of the acceleration sensor.

A restitution coefficient measuring device measuring a restitution coefficient of a measuring object includes a holder that holds a spherical impact ball colliding with the measuring object with an elastic member, a shooting mechanism for shooting the impact ball held by the holder from the holder toward the measuring object, a speed measuring unit that measures both a collision speed at which the impact ball collides with the measuring object and a restitution speed at which the impact ball bounces from the measuring object, and a computing unit that calculates the restitution coefficient on the basis of the restitution speed with respect to the collision speed. A hole for bleeding air is bored on any side surface of the holder. The elastic member is an independent member replaceable with respect to the holder and is disposed at an end portion of the holder in an axial direction.

A plastometer has: a main frame, a driving unit, an electromagnet, a loading dock, a lower mold, an upper mold and a measuring unit the driving unit drives the lifting platform, so the lifting platform makes a stable elevating displacement along the two supporting columns. Then, the electromagnet attracts and controls the loading dock, so the pressure amount to be provided by the loading dock for each test object 80 can be simply obtained, and the measurement operation is actually performed by the measuring unit which can get accurate test results to improve the measurement efficiency of the relevant industry.

A device for nondestructive viscoelastic characterization of materials, comprising: a tubular shell, having inside a through-recess provided with at least a first and a second shrinkage; a first rod, provided with a base of ferromagnetic material (8), sliding inside said shell between a first position, in which said ferrule does not project to the lower base of said shell, and a second position, in which said ferrule projects to said lower base; a first spring configured to push said ferrule outwards; a displacement sensor configured to read the displacement of said first rod; a button, sliding between a stroke greater than the one of said first rod, and integral to a second rod provided with a magnet and coaxial to said first rod; a second spring.

A device for nondestructive viscoelastic characterization of materials, comprising: a tubular shell, having inside a through-recess provided with at least a first and a second shrinkage; a first rod, provided with a base of ferromagnetic material (8), sliding inside said shell between a first position, in which said ferrule does not project to the lower base of said shell, and a second position, in which said ferrule projects to said lower base; a first spring configured to push said ferrule outwards; a displacement sensor configured to read the displacement of said first rod; a button, sliding between a stroke greater than the one of said first rod, and integral to a second rod provided with a magnet and coaxial to said first rod; a second spring.

A device for measuring strength and strain softening parameters of a saturated clay sample based on full-flow penetration belongs to the technical field of geotechnical, geological and environmental research. The device mainly comprises two parts: an overlying pressure loading system and a full-flow penetration system. The present invention mainly aims at the problem of incomplete backflow of the soil in the measurement of soil strength and strain softening parameters with a full-flow penetrometer for saturated clay, and applies the working principle of a traditional consolidometer to vertically pressurize a soil sample to ensure the backflow of the soil, thereby improving the applicability of the full-flow penetrometer in the measurement aspect of the soil strength and the strain softening parameters and having important practical value for test research and marine engineering design.

A device for measuring strength and strain softening parameters of a saturated clay sample based on full-flow penetration belongs to the technical field of geotechnical, geological and environmental research. The device mainly comprises two parts: an overlying pressure loading system and a full-flow penetration system. The present invention mainly aims at the problem of incomplete backflow of the soil in the measurement of soil strength and strain softening parameters with a full-flow penetrometer for saturated clay, and applies the working principle of a traditional consolidometer to vertically pressurize a soil sample to ensure the backflow of the soil, thereby improving the applicability of the full-flow penetrometer in the measurement aspect of the soil strength and the strain softening parameters and having important practical value for test research and marine engineering design.

A plastometer has: a main frame, a driving unit, an electromagnet, a loading dock, a lower mold, an upper mold and a measuring unit the driving unit drives the lifting platform, so the lifting platform makes a stable elevating displacement along the two supporting columns. Then, the electromagnet attracts and controls the loading dock, so the pressure amount to be provided by the loading dock for each test object 80 can be simply obtained, and the measurement operation is actually performed by the measuring unit which can get accurate test results to improve the measurement efficiency of the relevant industry.