CN103344479A - Composite indentation experimental system with indenter securing device - Google Patents

Abstract

The purpose of the invention is to provide an experimental system to eliminate the adverse effects caused by the offset of the indenter in the device used in the existing composite material indentation experiment. That is, a composite material indentation test system with an indenter stabilizing device, including a workbench carrying a test sample, a load shaft above the workbench, a driving device for controlling the movement of the load shaft, and a load sensor. Also included is an adapter for use with an indenter. During the experiment, first adjust the height of the load shaft so that the connection seat connected to the lower end of the load shaft is a certain distance away from the tested sample, and then snap the upper end of the indenter into the T-shaped groove of the connection seat, so that The indenter can be vertically pressed to the upper end of the tested sample under the action of the load axis, avoiding the deviation and sliding that will seriously affect the experiment, and the measured data is accurate. Simultaneously, the present invention also reduces manual operation, and avoids the injury of mechanical equipment to experimenters.

Description

A Composite Material Indentation Experimental System with Indenter Stabilizer

technical field

The invention belongs to the field of research on mechanical properties of materials, and in particular relates to a composite material indentation test device. the

Background technique

At present, the indentation experiment of composite materials is still being explored, and there is no unified standard experimental device in this field. A common indentation test device includes a platform carrying a test sample (usually a flat metal porous material, a fiber-reinforced composite material, etc.), above which there is a loading shaft capable of exerting a downward force. There is an indenter between the loading shaft and the tested sample. According to the needs of the experiment, the indenter is usually made into various shapes, and its lower end is a conical head, a round head or a flat head, etc., and several indenters are often replaced in one experiment. The upper end of the pressure head is the contact surface with the loading shaft. During the experiment, the loading shaft is usually raised first; then the indenter is placed between the loading shaft and the sample to be tested, and at the same time, the indenter is straightened by hand so that the cone or round head at the lower end of the indenter is in contact with the sample to be tested; Then lower the height of the loading shaft to make it contact with the upper end of the indenter; finally, according to the needs of the experiment, apply a certain amount of force through the loading axial indenter to leave indentations on the upper surface of the tested sample for further analysis . the

In the above-mentioned device and method adopted in the prior art, since various indenters need to be replaced many times, the lower end of the indenter and the sample to be tested are easily deflected, and the loading shaft exerts force on the indenter, especially the impact When the force is applied, it will cause the lower end of the indenter to slide on the upper surface of the test sample and other uncontrollable situations, which will bring uncertainty to the measurement of the force. And in the case of heavy load, the existing indentation test device will even cause danger to the experimenters. the

Contents of the invention

The purpose of the invention is to provide an experimental system to eliminate the adverse effects caused by the offset of the indenter in the device used in the existing composite material indentation experiment. the

The technical solution adopted to realize the creation purpose of the present invention is as follows, a composite material indentation experiment system with an indenter stabilizing device, including a workbench carrying the tested sample, a load shaft located above the workbench, a control A driving device for the movement of the load shaft, and a load sensor. Also included is an adapter for use with an indenter. the

The indenter is formed by connecting a cylinder I and a cylinder II, the lower bottom of the cylinder II is connected with the upper bottom of the cylinder I, the diameter of the bottom surface of the cylinder II is d2, and the diameter of the bottom surface of the cylinder I is is d1, d1<d2. The lower end of the cylinder I is connected with a conical head, a flat head or a round head. the

The connecting seat has horizontal upper and lower end surfaces. The upper end surface of the connecting seat is connected to the lower end surface of the load shaft. The lower end surface of the connecting base has a T-shaped groove, the width of the upper end of the T-shaped groove is B, and the width of the lower end of the T-shaped groove is A, B≥d2, d2>A≥d1. the

Further, the upper end surface of the connecting seat is wedged into the magnet. the

The technical effect of the present invention is unquestionable. During the experiment, firstly adjust the height of the load shaft so that the connecting seat connected to the lower end of the load shaft is a certain distance away from the tested sample, and then snap the upper end of the indenter into the In the T-shaped groove of the connecting seat, so that the indenter can be vertically pressed to the upper end of the tested sample under the action of the load axis, avoiding the serious impact of the offset and sliding of the indenter on the experiment, and the measurement data is accurate . Simultaneously, the present invention also reduces manual operations, and avoids the injury of mechanical equipment to experimenters. the

Description of drawings

The device created by the invention can be further illustrated by the non-limiting examples given in the accompanying drawings. the

Fig. 1 is the perspective view of connecting seat of the present invention;

Fig. 2 is the bottom view of the connecting seat of the present invention;

Fig. 3 is a top view of the connection seat of the present invention;

Fig. 4 is a side view of the connecting seat of the present invention;

Fig. 5 is the schematic diagram of cone head indenter of the present invention;

Fig. 5 is a schematic diagram of the round head indenter of the present invention.

Fig. 6 is a schematic diagram of the round head indenter of the present invention.

In the figure: 1-connecting seat, 2-pressure head, 3-T-slot, 4-magnet. the

Detailed ways

The present invention will be further described below in conjunction with the examples, but it should not be understood that the scope of the above subject matter of the present invention is limited to the following examples. Without departing from the above-mentioned technical ideas of the present invention, various replacements and changes made according to common technical knowledge and customary means in this field shall be included in the protection scope of the present invention. the

See the attached picture: a composite material indentation experiment system with an indenter stabilizing device in the figure, including a workbench carrying the tested sample (usually a flat metal porous material, fiber-reinforced composite material, etc.), and load loading system. The load loading system is a load shaft located above the workbench, a driving device for controlling the movement of the load shaft, and a load sensor. This embodiment also includes a connecting seat 1 used in conjunction with the indenter 2 . In this embodiment, in order to better cooperate with the connection base 1 , the lower end of the load shaft (that is, the end facing the tested sample) is a horizontal surface. the

In this embodiment, the indenter 2 is formed by connecting cylinder I and cylinder II. The lower bottom of the cylinder II is connected to the upper bottom of the cylinder I, the diameter of the bottom surface of the cylinder II is d2, and the diameter of the bottom surface of the cylinder I is d1, d1<d2, that is, the bottom surface of the cylinder II and the cylinder I Concentric, and the diameter of the bottom surface of cylinder II is larger than the diameter of the bottom surface of cylinder I. In actual processing, the cylinder II and the cylinder I, and the cone or round head at the lower end of the cylinder I are integrally formed. From another perspective, that is, the upper end of the cylinder I has a circular boss. the

Referring to Figures 5-6, according to the needs of the experiment, the lower end of the cylinder I is connected to a conical head, a flat head or a round head, and the size of the conical head or the round head is determined according to the needs of the experiment. the

The connecting seat 1 has horizontal upper and lower end surfaces. The upper end surface of the connecting seat 1 is connected to the lower end surface of the load shaft. The lower end surface of the connecting seat 1 has a T-shaped groove 3. Further, referring to FIG. 1, the connecting seat 1 of this embodiment is a cylindrical metal block with a horizontal upper and lower end surface, and the T-shaped opening end of the T-shaped groove 3 is in the cylinder. The side of the metal block. The cylinder II at the upper end of the indenter 2 slides into the upper end of the T-shaped groove 3 , that is, the T-shaped groove 3 cooperates with the upper end of the indenter 2 . Furthermore, the width of the upper end of the T-shaped groove 3 is B, and the width of the lower end is A, where B≥d2, d2>A≥d1. Preferably, the width of the upper end of the T-shaped groove 3 is 1-2 mm larger than the diameter of the cylinder II. the

In this embodiment, the upper end surface of the connecting seat 1 needs to be connected to the lower end of the load shaft. Preferably, the load shaft is made of steel, and its lower end is a flat bottom end. The upper end surface of the connecting seat 1 is wedged into the magnet 4 so as to stick to the lower end of the load shaft by magnetic force. the

Claims (2)

1. A composite material indentation test system with an indenter stabilizing device, comprising a workbench carrying a tested sample, a load shaft positioned above the workbench, and a driving device controlling the motion of the load shaft; it is characterized in that: It also includes a connection seat (1) used in conjunction with the indenter (2); The indenter (2) is formed by connecting a cylinder I and a cylinder II, the lower bottom of the cylinder II is connected with the upper bottom of the cylinder I, the diameter of the bottom surface of the cylinder II is d ₂ , the cylinder The diameter of the bottom surface of I is d ₁ , d ₁ <d ₂ ; the lower end of the cylinder I is connected with a conical head, a flat head or a round head; The connecting seat (1) has horizontal upper and lower end surfaces; the upper end surface of the connecting seat (1) is connected to the lower end surface of the load shaft; the lower end surface of the connecting seat (1) has a T-shaped groove (3), the The groove width at the upper end of the T-shaped groove (3) is B, and the groove width at the lower end is A, where B≥d ₂ , and d ₂ >A≥d ₁ . 2. The indentation test system with an indenter stabilizing device according to claim 1, characterized in that: the upper end surface of the connection base (1) is wedged into the magnet (4).

Images