Bearing clamp for nanometer stretching instrument and related experimental method

Abstract

The invention discloses a bearing clamp for a nanometer stretching instrument and a related experimental method, and belongs to the technical field of micro-scale mechanical property testing. The bearing clamp is composed of an upper clamping head, a lower clamping head, adjusting nuts, lead screws, guide rail grooves, limiting grooves, pins, carrier pieces and sample grooves. The lead screws areconnected with the carrier pieces correspondingly, the carrier pieces are controlled to move up and down through the adjusting nuts, and meanwhile, the lead screws and the adjusting nuts achieve self-locking. The sample grooves are formed on the corresponding carrier pieces for placing experimental materials; and the carrier pieces can move up and down along the guide rail grooves. The limiting grooves ensure the centering performance of the upper clamping head and the lower clamping head and the upper and lower clamping heads can be fixed through the pins. The bearing clamp can realize fixation of brittle biological materials such as honeybee veins, honeybee needles and plant fibers, so that damage to the experimental materials due to slight shaking in the clamping process is avoided, theclamping process is simplified, the experimental efficiency is improved, meanwhile, the centering performance of the experimental materials in the clamping process can be guaranteed, and the accuracyof experimental data is improved.

Description

technical field [0001] The invention relates to a clamp, in particular to a fixing clamp used in conjunction with a nano-stretch instrument to test the micro-nano tensile properties of small-sized fiber materials. The invention also relates to a method for performing a nano-stretching experiment using the above-mentioned clamp, which belongs to the technical field of micro-scale mechanical performance testing. Background technique [0002] At present, the mechanical property testing technology of micro-nano-scale materials such as biological materials and fibers based on the micro-nano stretching method has become an effective method in its field. However, the currently used clamps can only fix the samples that have been bonded to the cardboard by resin glue in advance, and cannot directly clamp the experimental materials. Due to the fixing of the jam by the clamp, there is residual stress inside the jam. For brittle materials with an effective tensile length of less than 2...

AI Technical Summary

Problems solved by technology

[0003] Existing clamps for nanotensometers cannot directly fix brittle materials that are easy to break. Usually, cardboard is used to prepare a disposable paper slide, and the experimental materials are pasted on the slide. After the clamping is completed, the card is cut off. Tensile test was carried out on the excess part of the paper slide

Due to the light weight and easy deformation of the cardboard, it has brought great difficulties to the sample sticking and clamping, and due to the fixation of the slide during the clamping process, there will be residual stress in the paper card, resulting in the cutting process of jamming. It is easy to produce slight shaking in the middle, which can easily lead to bending or fracture of brittle experimental materials, affecting the progress of the experiment and the accuracy of the experimental results

For the experimental material whose tensile effective length is less than 2mm, a slight vibration can easily cause the material to break directly

In the process of each clamping test material, the existing fixture needs to be centered by naked eyes to ensure that the specimen is accurately clamped at the center of the micro-nano tensile instrument, so that the material is only subjected to vertical tension during the tensile test, but the process It is cumbersome and seriously affects the efficiency of the experiment

Disposable paper slides will cause great waste and cannot be reused, and the quality of the slides prepared each time will have a certain impact on the experimental results

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