CN112229705B - Marine composite steel plate interface shear strength testing method - Google Patents
Marine composite steel plate interface shear strength testing method Download PDFInfo
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- G—PHYSICS
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
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- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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Abstract
The invention discloses a method for testing the interfacial shear strength of a marine composite steel plate, which is tested by using a separated Hopkinson pressure bar, and mainly comprises the following steps of: firstly, designing a sample, a loading piece and a clamping piece, then respectively connecting the loading piece and the clamping piece with an incidence rod and a transmission rod of a separated Hopkinson pressure bar in a threaded manner, and placing the sample in a sample mounting block; adjusting the punch to be coaxial with the multi-layer of the sample, and erecting a high-speed camera system, wherein the punch is taken as an observation area; and starting a loading system of the separated Hopkinson pressure bar to perform a test, and recording the dynamic shear strain rate and the dynamic shear strength at the interface by strain information through strain sheets stuck on the incident bar and the transmission bar. By adopting the dynamic test method, effective dynamic load can be applied to the composite steel plate, and the interface shear strength value can be calculated, so that necessary technical guarantee is provided for effective test of the interface performance of the composite steel plate.
Description
Technical Field
The invention relates to the technical field of testing of breaking resistance of metal materials, in particular to a method for testing interfacial shear strength of a marine composite steel plate.
Background
The polar region has very abundant natural resources and has important supporting effect on sustainable development of future world economy and society. According to an evaluation report published by the united states geological exploration, arctic possesses 13% of the undetermined petroleum reserves worldwide, while possessing 30% of the undeveloped natural gas reserves worldwide and 9% of the world's coal resources. With global warming and sea ice mass melting, the polar resources and the polar channel with high value are greatly improved in the strategic position of the polar region. Since most developed countries in the world are located at 30 ° north from north latitude, 80% of industrial products worldwide and 70% of international trade occur in this area, and the development of arctic airlines can greatly improve the operational benefits of ships.
Polar vessels are the main platform for polar survey, polar shipping, and polar resource development. The climatic environment of the polar region is extremely severe, the polar region is iced at low temperature throughout the year, and the lowest temperature of the polar region can reach-59 ℃. In the sailing process of the polar region ship, the polar region ship is exposed to the low-temperature seawater environment for a long time, and on the other hand, the polar region ship inevitably collides with the ice layer and the floating ice, so that the ship body structure has an increased tendency of low-stress brittle fracture due to the factors, the safety and reliability of the ship body structure are seriously threatened, and meanwhile, the coating material on the surface of the ship body is easily fallen off due to the impact of the ice layer, so that the ship body part is directly exposed to the polar region seawater environment, and the corrosion of the ship body is accelerated.
In order to effectively solve the problem, in recent years, composite steel plates are increasingly used for constructing a polar ship hull structure abroad. The steel plate consists of austenitic stainless steel (cladding) + "ferritic steel" (base layer). The multi-layer austenitic stainless steel has good corrosion resistance and low-temperature plasticity, reduces the requirement on coating materials and has good ice layer impact resistance; the basic layer ferrite steel has higher strength and low-temperature toughness, and can effectively ensure the rigidity and low-temperature brittle failure resistance of the structure. Russia, japan, finland have successively used clad steel plates for construction of polar vessels.
The shear strength of the interface of the composite steel plate is one of the core performances for guaranteeing the safety of the hull structure. In the existing standard specification (GB/T6396-2008 "method for testing mechanical and technological properties of composite Steel plate"), the interfacial shear strength of composite Steel plate is mainly measured by adopting a quasi-static test method, and the highest stress loading speed in the test process is only 15MPa/s. According to estimation, the stress loading rate at the interface of the composite steel plate can reach more than 50MPa/s in the impact process of the polar ship with the ice layer and the floating ice. The existing research results show that the strength of the material is closely related to the loading rate and rises along with the increase of the loading rate, so that an interface strength test technology under dynamic loading is required to be established for correctly evaluating the interface strength of the composite steel plate in the actual use process.
At present, the main test method for the dynamic strength of the material is a separation type Hopkinson pressure bar technology, a test schematic diagram is shown in fig. 1, and a test device mainly comprises an air gun 1, a bullet 2, an incident bar 3 and a transmission bar 5. In the test, the bullet 2 is driven by the air gun 1 to strike the incidence rod 3, the incidence rod 3 compresses the sample to deform at a high speed, the strain gauge 4 is stuck on the incidence rod 3 and the transmission rod 5 to record the strain information in the test process, and the dynamic strength of the sample can be obtained after calculation according to a related formula.
In order to accurately evaluate the interfacial shear strength of the composite steel plate when the composite steel plate is used for a ship body structure, and further effectively ensure the use safety of a polar ship, an effective dynamic test method for the interfacial shear strength of the composite steel plate for the ship needs to be designed.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a method for testing the interfacial shear strength of a marine composite steel plate, which can apply effective dynamic load to the composite steel plate and calculate the interfacial shear strength value by designing a sample, a loading part and a clamping part on the basis of a separated Hopkinson pressure bar device, and provides necessary technical support for realizing effective test of the interfacial performance of the composite steel plate.
In order to achieve the above purpose, the invention adopts the following specific scheme:
the method for testing the interfacial shear strength of the marine composite steel plate is carried out by utilizing a separated Hopkinson pressure bar, wherein the diameters of an incident bar and a transmission bar in the separated Hopkinson pressure bar are equal, and the testing method mainly comprises the following steps of:
step one, designing a sample, a loading piece and a clamping piece, wherein the sample comprises a base layer and a plurality of layers which are parallel to each other from bottom to top, the base layer and the plurality of layers are cuboid, the plurality of layers are consistent with the length direction of the base layer, the length of the plurality of layers is smaller than that of the base layer, and one end of the plurality of layers close to the base layer is provided; the loading piece comprises a first thread part with a consistent central line and a punch head, wherein the first thread part is used for connecting the loading piece with an incidence rod, and the punch head is used for impacting a sample substrate; the clamping piece comprises a second threaded part and a sample loading block, wherein the second threaded part is used for connecting the clamping piece with the transmission rod, the center line of the second threaded part is consistent with the center line of the second threaded part, the sample loading block is cuboid, one end of the sample loading block, which is far away from the second threaded part, is provided with a stepped through groove with the extension direction perpendicular to the length direction of the clamping piece, the stepped through groove comprises a groove I which is arranged at the upper part and can accommodate a composite layer, and a groove II which is arranged at the lower part and can accommodate a base layer, the length of the groove II is greater than that of the base layer, so that the base layer can move along the length direction of the groove II under the action of a punch;
step two, the loading piece and the clamping piece are respectively connected with an incidence rod and a transmission rod of the separated Hopkinson pressure bar in a threaded manner, and a sample is placed in a sample loading block;
step three, adjusting the positions of the incident rod and the transmission rod to enable the end face of the punch to be in contact with the end face of the multi-layer of the sample and keep a coaxial state;
step four, starting a loading system of a separated Hopkinson pressure bar, enabling a bullet to strike an incident bar, enabling a punch to strike a base layer of a sample to move along the length direction of a groove II so as to enable the base layer and a composite layer to be stripped at an interface, collecting strain information recorded by strain gauges stuck on the incident bar and the projection bar through a strain gauge, and respectively calculating dynamic shear strain rate at the interface in the loading process according to the following formula
And dynamic shear strength τ at interface s ；
Wherein C is 0 For the wave speed of the stress wave in the rod, l s Epsilon is the length of the sample R For the strain value measured by the strain gauge on the incident beam, A b For the cross-sectional area of the incident beam and the emitting beam, A s Area of region for bearing shear load for multiple layers in sample E B For the modulus of elasticity, ε, of the incident and transmission rods T Strain values measured for strain gauges on the transmission rod.
Further, the length L2 of the base layer and the length L4 of the groove II satisfy the following conditions: l4 is not less than 1.5XL2.
Further, the length L1, the width W1 and the height H1 of the composite layer are respectively 2cm, 6cm and 2cm;
the length L2, the width W2 and the height H2 of the base layer are respectively 8cm, 6cm and 4cm;
the length L3, the width W3 and the height H3 of the groove I are respectively 2.5cm, 14.5cm and 2.5cm;
the length L4, the width W4 and the height H4 of the groove II are respectively 16cm, 14.5cm and 4.5cm.
Further, the distance between the right side wall of the composite layer and the right side wall of the base layer is 5cm.
Further, the hardness of the material used for the punch is not lower than 600HV.
Further, the hardness of the material used for the clamping member is not lower than 400HV.
In detail, in the second step, after the sample is placed in the sample loading block, a thin copper sheet for filling the gap is placed between the cladding layer and the side wall of the groove I.
The beneficial effects are that:
according to the method for testing the shear strength of the interface of the marine composite steel plate, which is provided by the invention, (1) dynamic shear loading of the interface can be realized, when a test is carried out, a punch is adopted to impact a base layer of a sample, the base layer moves along the length direction of a transmission rod together with a composite layer, when the composite layer moves to the joint of a groove I and a groove II, the composite layer and the base layer are peeled off due to in-plane relative displacement under the action of the joint, and then dynamic shear damage occurs; (2) a high shear deformation rate can be obtained. The size of the sample designed by the invention is smaller, higher movement speed can be obtained under the impact action of the punch, and higher shearing deformation speed can be generated at the interface when the sample meets the connection parts of the groove I and the groove II; (3) The shear strain rate in the loading process can be determined more accurately. Recording strain information through strain gauges stuck on an incident rod and a transmission rod, and calculating the dynamic shear strain rate at the interface in the loading process according to a formula; (4) The test device is simple in form, high in test success rate, convenient and reliable, and the loading piece and the clamping piece are respectively connected with the incident rod and the transmission rod in a threaded manner; through rotatory incident pole and transmission pole, can adjust the relative position of drift and sample, guarantee loaded axiality, easy and simple to handle and can effectively guarantee the reliability of data, improve test success rate.
By adopting the dynamic test method of the interface shear strength, the dynamic shear loading of the interface of the composite steel plate can be realized, the sample can obtain higher shear deformation speed and can accurately determine the dynamic shear strain rate, the dynamic shear strength of the interface of the composite steel plate for the ship can be effectively evaluated, and the method can provide powerful technical support for the application of the composite steel plate on the polar ship safely and reliably.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will briefly explain the drawings used in the embodiments or the prior art. It is evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 is a schematic diagram of the dynamic strength of a material tested in the prior art using a split Hopkinson plunger.
Fig. 2 is a schematic diagram of the shear strength of a clad steel plate tested using a split Hopkinson plunger in the present invention.
Fig. 3 is a front view of the loader.
Fig. 4 is a top view of the loading member.
Fig. 5 is a front view of the clip.
Fig. 6 is a top view of the clip.
Fig. 7 is a front view of the test specimen.
Fig. 8 is a top view of the sample.
The graphic indicia: 1. air gun, 2, bullet, 3, incident rod, 4, strain gauge, 5, transmission rod, 6, loading piece, 601, first screw thread portion, 602, punch, 7, clamping piece, 701, second screw thread portion, 702, sample loading block, 7021, groove I,7022, groove II,8, sample, 801, multiple layers, 802, base layer.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below in connection with specific embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
Referring to fig. 2, a test method for interfacial shear strength of a marine clad steel plate is disclosed, wherein the test is performed by using a split type Hopkinson compression rod, and the diameters of an incident rod 3 and a transmission rod 5 in the split type Hopkinson compression rod are equal, and the test method mainly comprises the following steps:
step one, designing a sample, a loading part and a clamping part, please refer to fig. 7-8, wherein the sample 8 comprises a cuboid base layer 802 and a cuboid compound layer 801 arranged on the upper surface of the base layer 802, the compound layer 801 is consistent with the length direction of the base layer 802, the length of the compound layer 801 is smaller than the length of the base layer 802, and one end of the compound layer close to the base layer is provided; referring to fig. 3 to 4, the loading member 6 includes a first threaded portion 601 for connecting the loading member 6 to the incident rod 3 and a punch 602 for striking the base layer 802, wherein the hardness of the material used for the punch 602 is not lower than 600HV; referring to fig. 5 to 6, the clamping member 7 includes a second threaded portion 701 with a consistent center line for connecting the clamping member 7 with the transmission rod 5, and a sample loading block 702 for clamping the sample 8, wherein the hardness of the material used for the clamping member 7 is not lower than 400HV, the sample loading block 702 is rectangular parallelepiped, the sample mounting block 702 is provided with a stepped through groove with an extension direction perpendicular to the length direction of the clamping piece 7 at one end far away from the second threaded part 701, the stepped through groove comprises a groove I7021 capable of containing the composite layer 801 and a groove II 7022 capable of containing the base layer 802 at the upper part, and the length of the groove II 7022 is greater than that of the base layer 802 so that the base layer 802 can move along the length direction of the groove II 7022 under the force;
step two, the loading piece 6 and the clamping piece 7 are respectively in threaded connection with the incidence rod 3 and the transmission rod 5 of the separated Hopkinson pressure bar, and the sample 8 is placed in the clamping piece 7;
step three, adjusting the positions of the incidence rod 3 and the transmission rod 5 to enable the end face of the punch 602 to be in contact with the end face of the complex layer 801 of the sample 8 and keep a coaxial state;
step four, starting a loading system of a separated Hopkinson pressure bar, enabling a bullet 2 to strike an incident rod 3, enabling a punch 602 to strike a base layer 802 of a sample 8 to move along the length direction of a groove II 7022 so as to enable the base layer 802 and a composite layer 801 to be peeled off at an interface, collecting strain information recorded by strain gauges stuck on the incident rod and a projection rod through a strain gauge, and respectively calculating dynamic shear strain rate at the interface in the loading process according to the following formula
And dynamic shear strength τ at interface s ；
Wherein C is 0 For the wave speed of the stress wave in the rod, l s Epsilon is the length of the sample R For the strain value measured by the strain gauge on the incident beam, A b For the cross-sectional area of the incident beam and the emitting beam, A s Area of region for bearing shear load for multiple layers in sample E B For the modulus of elasticity, ε, of the incident and transmission rods T Strain values measured for strain gauges on the transmission rod.
It should be noted that, the length L2 of the base layer 802 and the length L4 of the groove II 7022 satisfy: l4 is more than or equal to 1.5 xL 2, so that the base layer of the sample can move forward along the length direction of the groove II under the action of the punch, and the base layer and the multiple layers are ensured to be stripped from each other.
Specifically, referring to fig. 2 to 8, the length L1, the width W1, and the height H1 of the composite layer 801 are 2cm, 6cm, and 2cm, respectively, and the length L2, the width W2, and the height H2 of the base layer 802 are 8cm, 6cm, and 4cm, respectively, and the dimensions can ensure that the sample 8 does not warp during the test, and can obtain a higher deformation speed. Groove I of groove I7021 has a length L3, a width W3 and a height H3 of 2.5cm, 14.5cm and 2.5cm, respectively, groove II 7022 has a length L4, a width W4 and a height H4 of 16cm, 14.5cm and 4.5cm, respectively, the distance between the right side wall of the composite layer 801 and the right side wall of the base layer 802 is 5cm, and the height of the end of the punch 602 contacting the base layer 802 is 4cm.
In the second step, after the sample 8 is mounted, a gap is inevitably present between the sample 8 and the side wall of the groove I7021, and this gap can be filled by a thin copper sheet.
Example 1
A method for testing the interfacial shear strength of a marine clad steel plate comprises the following steps:
(1) The processing sample, the loading piece and the clamping piece are in detail, the sample comprises a base layer and a composite layer which are parallel to each other from bottom to top, the composite layer and the base layer are cuboid, the length L1, the width W1 and the height H1 of the composite layer 801 are respectively 2cm, 6cm and 2cm, the length L2, the width W2 and the height H2 of the base layer 802 are respectively 8cm, 6cm and 4cm, and the distance between the right side wall of the composite layer 801 and the right side wall of the base layer 802 is 5cm; the loading piece 6 comprises a first thread part 601 which is consistent with the central line and is used for connecting the loading piece 6 with the incidence rod 5 and a punch 602 which is used for impacting the sample substrate; the clamping piece 7 comprises a second threaded part 701 and a sample holding block 702, wherein the second threaded part 701 is used for connecting the clamping piece 7 with the transmission rod 5, the center line of the second threaded part is consistent, the sample holding block 702 is in a cuboid shape, one end of the sample holding block 702 far away from the second threaded part 701 is provided with a stepped through groove with the extending direction perpendicular to the length direction of the clamping piece 7, the stepped through groove comprises a groove I7021 capable of containing the composite layer 801 at the upper part and a groove II 7022 capable of containing the base layer 802 at the lower part, and the length L3, the width W3 and the height H3 of the groove I7021 are respectively 2.5cm, 14.5cm and 2.5cm; the length L4, the width W4 and the height H4 of the groove II 7022 are respectively 16cm, 14.5cm and 4.5cm; the number of samples 8 is three.
Step two, the loading piece 6 and the clamping piece 7 are respectively in threaded connection with the incidence rod 3 and the transmission rod 5 of the separated Hopkinson pressure bar, and the sample 8 is placed in the sample placing block 702;
step three, adjusting the positions of the incidence rod 3 and the transmission rod 5 to enable the end face of the punch 602 to be in contact with the end face of the cladding 802 of the sample 8 and keep a coaxial state;
step four, starting a loading system of a separated Hopkinson pressure bar, enabling a bullet 2 to strike an incident rod 3, enabling a punch 602 to impact a base layer 802 of a sample 8 to move so as to enable the base layer 802 and a composite layer 801 to be peeled off at an interface, collecting strain information recorded by strain gauges 4 stuck on the incident rod 3 and a projection rod 5 through a strain gauge, and respectively calculating dynamic shear strain rate at the interface in the loading process by utilizing a formula (1) and a formula (2)
And dynamic shear strength τ at interface s ；
Wherein C is 0 For the wave speed of the stress wave in the rod, l s Epsilon is the length of the sample R For the strain value measured by the strain gauge on the incident beam, A b For the cross-sectional area of the incident beam and the emitting beam, A s Area of region for bearing shear load for multiple layers in sample E B For the modulus of elasticity, ε, of the incident and transmission rods T Strain values measured for strain gauges on the transmission rod.
Repeating the steps (2) - (4), and obtaining the dynamic shear strain rate and the dynamic shear strength of three identical samples 8 under the same loading condition, wherein the dynamic shear strain rates of the sample 1, the sample 2 and the sample 3 obtained by calculating by using the formula (1) are respectively 1988s -1 、2024s -1 、1966s -1 The method comprises the steps of carrying out a first treatment on the surface of the The dynamic shear strengths of the sample # 1, sample # 2, and sample # 3 calculated by the formula (2) were 729Ma, 745Ma, and 74, respectively6Ma. The test results (dynamic shear strain rate and dynamic shear strength) of the three parallel test samples 8 have good repeatability under the same loading condition, namely, the data obtained by the dynamic shear test method is reliable, practical and feasible.
The above description is only of the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. All equivalent changes or modifications made according to the essence of the present invention should be included in the scope of the present invention.
Claims (6)
1. The method for testing the interfacial shear strength of the marine composite steel plate is characterized by testing by utilizing a separated Hopkinson pressure bar, wherein the diameters of an incident bar and a transmission bar in the separated Hopkinson pressure bar are equal, and the testing method mainly comprises the following steps of:
step one, designing a sample, a loading piece and a clamping piece, wherein the sample comprises a base layer and a plurality of layers which are parallel to each other from bottom to top, the base layer and the plurality of layers are cuboid, the plurality of layers are consistent with the length direction of the base layer, the length of the plurality of layers is smaller than that of the base layer, and one end of the plurality of layers close to the base layer is provided; the loading piece comprises a first thread part with a consistent central line and a punch head, wherein the first thread part is used for connecting the loading piece with an incidence rod, and the punch head is used for impacting a sample substrate; the clamping piece comprises a second threaded part and a sample loading block, wherein the second threaded part is used for connecting the clamping piece with the transmission rod, the center line of the second threaded part is consistent with the center line of the second threaded part, the sample loading block is cuboid, one end of the sample loading block, which is far away from the second threaded part, is provided with a stepped through groove with the extension direction perpendicular to the length direction of the clamping piece, the stepped through groove comprises a groove I which is arranged at the upper part and can accommodate a composite layer, and a groove II which is arranged at the lower part and can accommodate a base layer, the length of the groove II is greater than that of the base layer, so that the base layer can move along the length direction of the groove II under the action of a punch;
step two, the loading piece and the clamping piece are respectively connected with an incidence rod and a transmission rod of the separated Hopkinson pressure bar in a threaded manner, and a sample is placed in a sample loading block;
step three, adjusting the positions of the incident rod and the transmission rod to enable the end face of the punch to be in contact with the end face of the multi-layer of the sample and keep a coaxial state;
step four, starting a loading system of a separated Hopkinson pressure bar, enabling a bullet to strike an incident bar, enabling a punch to strike a base layer of a sample to move so as to enable the base layer and a composite layer to be stripped at an interface, collecting strain information recorded by strain gauges stuck on the incident bar and the projection bar through a strain gauge, and respectively calculating dynamic shear strain rate at the interface in the loading process according to the following formula
And dynamic shear strength τ at interface s ；
Wherein C is 0 For the wave speed of the stress wave in the rod, l s Epsilon is the length of the sample R For the strain value measured by the strain gauge on the incident beam, A b For the cross-sectional area of the incident beam and the emitting beam, A s Area of region for bearing shear load for multiple layers in sample E B For the modulus of elasticity, ε, of the incident and transmission rods T A strain value measured for a strain gauge on the transmissive rod;
the length L1, the width W1 and the height H1 of the composite layer are respectively 2cm, 6cm and 2cm;
the length L2, the width W2 and the height H2 of the base layer are respectively 8cm, 6cm and 4cm;
the distance between the right side wall of the composite layer and the right side wall of the base layer is 5cm.
2. The method for testing the interfacial shear strength of the marine clad steel plate according to claim 1, wherein the method comprises the following steps: the length L2 of the base layer and the length L4 of the groove II satisfy the following conditions: l4 is not less than 1.5XL2.
3. The method for testing the interfacial shear strength of the marine clad steel plate according to claim 2, wherein the method comprises the following steps:
the length L3, the width W3 and the height H3 of the groove I are respectively 2.5cm, 14.5cm and 2.5cm;
the length L4, the width W4 and the height H4 of the groove II are respectively 16cm, 14.5cm and 4.5cm.
4. The method for testing the interfacial shear strength of the marine clad steel plate according to claim 1, wherein the method comprises the following steps: the hardness of the material adopted by the punch is not lower than 600HV.
5. The method for testing the interfacial shear strength of the marine clad steel plate according to claim 1, wherein the method comprises the following steps: the hardness of the material used for the clamping piece is not lower than 400HV.
6. The method for testing the interfacial shear strength of the marine clad steel plate according to claim 1, wherein the method comprises the following steps: and step two, after the sample is placed in the sample mounting block, a thin copper sheet for filling the gap is placed between the composite layer and the side wall of the groove I.
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