CN112229705A - Method for testing interface shear strength of marine composite steel plate - Google Patents

Method for testing interface shear strength of marine composite steel plate Download PDF

Info

Publication number
CN112229705A
CN112229705A CN202010987518.4A CN202010987518A CN112229705A CN 112229705 A CN112229705 A CN 112229705A CN 202010987518 A CN202010987518 A CN 202010987518A CN 112229705 A CN112229705 A CN 112229705A
Authority
CN
China
Prior art keywords
sample
base layer
rod
steel plate
length
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202010987518.4A
Other languages
Chinese (zh)
Other versions
CN112229705B (en
Inventor
宫旭辉
高珍鹏
牛佳佳
丁鹏龙
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
725th Research Institute of CSIC
Original Assignee
725th Research Institute of CSIC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 725th Research Institute of CSIC filed Critical 725th Research Institute of CSIC
Priority to CN202010987518.4A priority Critical patent/CN112229705B/en
Publication of CN112229705A publication Critical patent/CN112229705A/en
Application granted granted Critical
Publication of CN112229705B publication Critical patent/CN112229705B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • G01N3/02—Details
    • G01N3/06—Special adaptations of indicating or recording means
    • G01N3/066—Special adaptations of indicating or recording means with electrical indicating or recording means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • 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
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0676—Force, weight, load, energy, speed or acceleration
    • 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
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0682—Spatial dimension, e.g. length, area, angle

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention discloses a method for testing the interfacial shear strength of a marine composite steel plate, which is used for testing by utilizing a separated Hopkinson pressure bar, and the dynamic test method mainly comprises the following steps: designing a sample, a loading piece and a clamping piece, then connecting the loading piece and the clamping piece with an incident rod and a transmission rod of a separated Hopkinson pressure bar respectively through threads, and placing the sample in a sample loading block; adjusting the punch to be coaxial with the multiple layers of the sample, and erecting a high-speed camera system by taking the punch as an observation area; and starting a loading system of the separated Hopkinson pressure bar for testing, and recording strain information through strain gauges adhered to an incident bar and a transmission bar to calculate the dynamic shear strain rate and the dynamic shear strength of the interface. 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 realizing effective test of the interface performance of the composite steel plate.

Description

Method for testing interface shear strength of marine composite steel plate
Technical Field
The invention relates to the technical field of metal material fracture resistance testing, in particular to a method for testing the interface shear strength of a marine composite steel plate.
Background
The polar region has abundant natural resources and has an important supporting function for the sustainable development of future economic society in the world. According to an evaluation report published by the U.S. geological exploration bureau, arctic has 13% of the worldwide unexplored oil reserves, while having 30% of the worldwide unexplored natural gas reserves and 9% of the world's coal resources. With the global warming and the melting of a large amount of sea ice, the strategic position of the polar region is greatly promoted by the rich resources and the valuable arctic channel in the polar region. Since most developed countries in the world are located under 30 degrees north of north latitude, 80% of industrial products and 70% of international trade occur in the world, and the development of arctic routes can greatly improve the ship operation benefit.
The polar ship is a main platform for polar exploration, polar shipping and polar resource development. The polar climate environment is extremely severe, the low temperature is too much ice throughout the year, and the minimum temperature in the arctic region can reach-59 ℃. In the navigation process of polar region ships, on one hand, the ships are exposed in a low-temperature seawater environment for a long time, on the other hand, the ships inevitably collide with an ice layer and floating ice, the tendency of low-stress brittle fracture of a ship structure is increased due to the two factors, the safety and the reliability of the ship structure are seriously threatened, and meanwhile, the coating material on the surface of the ship body is easy to fall off due to the collision of the ice layer, so that the ship body is directly exposed in 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 gradually adopted abroad to build a polar ship hull structure. The steel sheet is composed of "austenitic stainless steel" (multi-layer) + "ferritic steel" (base layer). The multilayer austenitic stainless steel has good corrosion resistance and low-temperature plasticity, so that the requirement on coating materials is reduced, and the multilayer austenitic stainless steel also has good ice layer impact resistance; the base layer ferrite steel has higher strength and low-temperature toughness, and can effectively ensure the rigidity and the low-temperature brittle failure resistance of the structure. Russian, Japan, Finland have used clad steel plates in the construction of polar vessels in succession.
The shear strength of the composite steel plate interface is one of the core performances for ensuring the safety of a hull structure. In the existing standard specification (GB/T6396-2008 & lttest method for mechanical and technological properties of composite steel plate'), the interfacial shear strength of the composite steel plate is mainly measured by a quasi-static test method, and the highest stress loading speed in the test process is only 15 MPa/s. According to estimation, the stress loading rate of the composite steel plate interface can reach over 50MPa/s in the process of impacting the polar region 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 is increased along with the increase of the loading rate, so that an interface strength testing technology under dynamic loading needs 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 a material is a separated Hopkinson pressure bar technology, the test schematic diagram is shown in figure 1, and the test device mainly comprises an air gun 1, a bullet 2, an incident bar 3 and a transmission bar 5. In the test, a bullet 2 is driven by an air gun 1 to impact an incident rod 3, the incident rod 3 compresses a sample to generate high-speed deformation, a strain gauge 4 is pasted on the incident rod 3 and a transmission rod 5 to record strain information in the test process, and the dynamic strength of the sample can be obtained after calculation according to a relevant formula.
In order to correctly evaluate the interface shear strength of the composite steel plate when the composite steel plate is used for a hull structure and further effectively guarantee the use safety of polar ships, an effective dynamic test method for the interface shear strength of the marine composite steel plate 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.
In order to achieve the purpose, the invention adopts the specific scheme that:
a method for testing the shearing strength of a marine composite steel plate interface is characterized in that a separated Hopkinson pressure bar is used for testing, the diameters of an incident rod and a transmission rod in the separated Hopkinson pressure bar are equal, and the method mainly comprises the following steps:
designing a sample, a loading piece and a clamping piece, wherein the sample comprises a base layer and a composite layer which are parallel to each other from bottom to top, the base layer and the composite layer are both in a cuboid shape, the length directions of the composite layer and the base layer are the same, the length of the composite layer is smaller than that of the base layer, and one end of the composite layer, which is close to the base layer, is arranged; the loading piece comprises a first threaded part and a punch, wherein the first threaded part is used for connecting the loading piece with the incident rod, and the punch is used for impacting the sample substrate; the clamping piece comprises a second thread part and a sample loading block, the second thread part is used for connecting the clamping piece with the transmission rod, the sample loading block is used for clamping a sample, the shape of the sample loading block is cuboid, a step through groove with the extending direction perpendicular to the length direction of the clamping piece is arranged at one end, away from the second thread part, of the sample loading block, the step through groove comprises a groove I which can accommodate the multiple layers at the upper part and a groove II which can accommodate the base layer at the lower part, and the length of the groove II is larger 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 the punch;
step two, the loading piece and the clamping piece are respectively in threaded connection with an incident rod and a transmission rod of the separated Hopkinson pressure bar, and the sample is placed in a sample loading block;
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 composite layer of the sample and keep the coaxial state;
fourthly, starting a loading system of the separated Hopkinson pressure bar to enable the bullet to impact the incident rod, enabling the punch to impact the base layer of the sample to enable the base layer and the compound layer to move along the length direction of the groove II so as to enable the base layer and the compound layer to be peeled off at the interface, collecting strain information recorded by strain gauges attached to the incident rod and the projection rod, and respectively calculating the dynamic shear strain rate at the interface in the loading process according to the following formula
Figure BDA0002689742090000021
And dynamic shear strength at the interfaceτs；
Figure BDA0002689742090000031
Figure BDA0002689742090000032
Wherein, C0The wave velocity of the stress wave in the rod,/sIs the length of the sample,. epsilonRStrain value measured for strain gauge on incident rod, AbIs the cross-sectional area of the incident rod and the emission rod, AsArea of shear load zone for multiple layers in the test specimen, EBIs the elastic modulus, ε, of incident and transmission rodsTStrain 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: l4 is more than or equal to 1.5 XL 2.
Further, the length L1, the width W1 and the height H1 of the multilayer are respectively 2cm, 6cm and 2 cm;
the length L2, width W2 and height H2 of the base layer are 8cm, 6cm and 4cm respectively;
the length L3, the width W3 and the height H3 of the groove I are respectively 2.5cm, 14.5cm and 2.5 cm;
the length L4, the width W4 and the height H4 of the groove II are respectively 16cm, 14.5cm and 4.5 cm.
Further, the distance between the right side wall of the composite layer and the right side wall of the base layer is 5 cm.
Further, the hardness of the material used for the punch is not less than 600 HV.
Further, the hardness of the material used for the holder is not lower than 400 HV.
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 composite layer and the side wall of the groove I.
Has the advantages that:
the invention provides a method for testing the interface shear strength of a marine composite steel plate, which comprises the following steps that (1) dynamic shear loading on an interface can be realized, during testing, a punch is adopted to impact a base layer of a sample, the base layer drives a composite layer to move along the length direction of a transmission rod, and when the composite layer moves to the joint of a groove I and a groove II, the composite layer is stripped from the base layer due to in-plane relative displacement under the blocking action of the joint, so that dynamic shear damage is generated; (2) higher shear deformation rates can be achieved. The designed sample has smaller size, can obtain higher movement speed under the impact action of the punch, and can generate higher shearing deformation speed at an interface when the sample meets the joint of the groove I and the groove II; (3) the shear strain rate in the loading process can be accurately determined. Recording strain information through strain gauges adhered to the incident rod and the transmission rod, and calculating the dynamic shear strain rate at the interface in the loading process according to a formula; (4) the form is simple, the success rate of the test is high, the loading piece and the clamping piece are respectively in threaded connection with the incident rod and the transmission rod, and the test is convenient and reliable; by rotating the incident rod and the transmission rod, the relative position of the punch and the sample can be adjusted, the loaded coaxiality is guaranteed, the operation is simple and convenient, the reliability of data can be effectively guaranteed, and the success rate of the test is improved.
By adopting the dynamic test method for the interface shear strength, the dynamic shear loading of the composite steel plate interface 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 marine composite steel plate interface can be effectively evaluated, and powerful technical support can be provided for the safe and reliable application of the composite steel plate on polar ships.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic diagram of the prior art for testing the dynamic strength of a material using a split Hopkinson pressure bar.
FIG. 2 is a schematic diagram of the shear strength of the clad steel plate tested by the split Hopkinson pressure bar according to the present invention.
Fig. 3 is a front view of the loading member.
Fig. 4 is a top view of the loading member.
Fig. 5 is a front view of the clamp.
Fig. 6 is a top view of the clamp.
Fig. 7 is a front view of the test piece.
Fig. 8 is a plan view of the test piece.
Graphic notation: 1. air gun, 2, bullet, 3, incident rod, 4, strain gauge, 5, transmission rod, 6, loading piece, 601, first thread part, 602, punch, 7, clamping piece, 701, second thread part, 702, sample loading block, 7021, groove I, 7022, groove II, 8, sample, 801, multiple layer, 802 and base layer.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to specific embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of the present invention.
Referring to fig. 2, a method for testing the shearing strength of the interface of a marine composite steel plate is tested by using a split type Hopkinson pressure bar, wherein the diameters of an incident rod 3 and a transmission rod 5 in the split type Hopkinson pressure bar are equal, and the method mainly comprises the following steps:
step one, designing a sample, a loading piece and a clamping piece, referring to fig. 7-8, wherein the sample 8 comprises a rectangular parallelepiped base layer 802 and a rectangular parallelepiped composite layer 801 arranged on the upper surface of the base layer 802, the length directions of the composite layer 801 and the base layer 802 are the same, the length of the composite layer 801 is smaller than that of the base layer 802, and one end of the composite layer close to the base layer is arranged; referring to fig. 3-4, the loading member 6 comprises a first threaded portion 601 with a consistent center line for connecting the loading member 6 with the incident rod 3 and a punch 602 for impacting the substrate 802, wherein the hardness of the material used for the punch 602 is not lower than 600 HV; referring to fig. 5 to 6, the clamping member 7 includes a second threaded portion 701 having a consistent center line and used for connecting the clamping member 7 with the transmission rod 5, and a sample loading block 702 used for clamping the sample 8, the hardness of the material used for the clamping member 7 is not lower than 400HV, the sample loading block 702 is rectangular, one end of the sample loading block 702 away from the second threaded portion 701 is provided with a stepped through slot having an extending direction perpendicular to the length direction of the clamping member 7, the stepped through slot includes a groove I7021 capable of accommodating the multiple layer 801 and a groove II 7022 capable of accommodating the base layer 802, 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 stress;
step two, the loading part 6 and the clamping part 7 are respectively in threaded connection with an incident rod 3 and a transmission rod 5 of the split Hopkinson pressure bar, and the sample 8 is placed in the clamping part 7;
step three, adjusting the positions of the incident rod 3 and the transmission rod 5, and enabling the end face of the punch 602 to be in contact with the end face of the composite layer 801 of the sample 8 and keeping the coaxial state;
step four, starting a loading system of the separated Hopkinson pressure bar to enable the bullet 2 to impact the incident rod 3, enabling the punch 602 to impact the base layer 802 of the sample 8 to enable the base layer 802 to move along the length direction of the groove II 7022 so as to enable the base layer 802 and the compound layer 801 to be peeled off at the interface, collecting strain information recorded by strain gauges attached to the incident rod and the projection rod, and respectively calculating the dynamic shear strain rate at the interface in the loading process according to the following formula
Figure BDA0002689742090000051
And dynamic shear strength at the interface τs；
Figure BDA0002689742090000052
Figure BDA0002689742090000053
Wherein, C0The wave velocity of the stress wave in the rod,/sIs the length of the sample,. epsilonRStrain value measured for strain gauge on incident rod, AbIs the cross-sectional area of the incident rod and the emission rod, AsArea of shear load zone for multiple layers in the test specimen, EBIs the elastic modulus, ε, of incident and transmission rodsTStrain 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 mutually peeled.
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, which can ensure that the sample 8 does not warp during the test process and can obtain a high deformation speed. 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 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 contact end of the punch 602 and the base layer 802 is 4 cm.
In step two, after the sample 8 is installed, a gap inevitably exists between the sample 8 and the side wall of the groove I7021, and the gap can be filled by a thin copper sheet.
Detailed description of the preferred embodiment 1
A method for testing the interface shear strength of a marine composite steel plate comprises the following steps:
(1) the test 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 5 cm; the loading piece 6 comprises a first thread part 601 with the same central line for connecting the loading piece 6 with the incident rod 5 and a punch 602 for impacting the sample substrate; the clamping piece 7 comprises a second thread part 701 and a sample loading block 702, the center lines of the second thread part 701 are consistent, the second thread part 701 is used for connecting the clamping piece 7 with the transmission rod 5, the sample loading block 702 is used for clamping a sample 8, the shape of the sample loading block 702 is a cuboid, a stepped through groove with the extending direction perpendicular to the length direction of the clamping piece 7 is arranged at one end, away from the second thread part 701, of the sample loading block 702, the stepped through groove comprises a groove I7021 capable of accommodating the composite layer 801 at the upper part and a groove II 7022 capable of accommodating 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, 14.5 cm; the length L4, the width W4 and the height H4 of the groove II 7022 are respectively 16cm, 14.5cm and 4.5 cm; the number of samples 8 was three.
Step two, the loading piece 6 and the clamping piece 7 are respectively in threaded connection with an incident rod 3 and a transmission rod 5 of the split Hopkinson pressure bar, and the sample 8 is placed in the sample loading block 702;
step three, adjusting the positions of the incident rod 3 and the transmission rod 5, and enabling the end face of the punch 602 to be in contact with the end face of the composite layer 802 of the sample 8 and to be in a coaxial state;
step four, starting a loading system of the separated Hopkinson pressure bar to enable the bullet 2 to impact the incident rod 3, enabling the punch 602 to impact the base layer 802 of the sample 8 to enable the base layer 802 and the compound layer 801 to be separated at the interface, collecting strain information recorded by the incident rod 3 and the strain gauge 4 adhered to the projection rod 5 through the strain gauge, and respectively calculating the dynamic shear strain rate at the interface in the loading process by using the formula (1) and the formula (2)
Figure BDA0002689742090000061
And dynamic shear strength at the interface τs；
Figure BDA0002689742090000062
Figure BDA0002689742090000063
Wherein, C0The wave velocity of the stress wave in the rod,/sIs the length of the sample,. epsilonRStrain value measured for strain gauge on incident rod, AbIs the cross-sectional area of the incident rod and the emission rod, AsArea of shear load zone for multiple layers in the test specimen, EBIs the elastic modulus, ε, of incident and transmission rodsTStrain values measured for strain gauges on the transmission rod.
Repeating the steps (2) to (4), and obtaining the dynamic shear strain rate and the dynamic shear strength of the three same samples 8 under the same loading condition, wherein the dynamic shear strain rates of the 1# sample, the 2# sample and the 3# sample obtained by calculation according to the formula (1) are respectively 1988s-1、2024s-1、1966s-1(ii) a The dynamic shear strengths of the 1# sample, the 2# sample, and the 3# sample calculated by the formula (2) were 729Ma, 745Ma, and 746Ma, respectively. Under the same loading condition, the test results (dynamic shear strain rate and dynamic shear strength) of the three parallel samples 8 have better repeatability, namely, the data obtained by the dynamic shear test method is reliable, practical and feasible.
The foregoing is merely a preferred embodiment of the invention and is not to be construed as limiting the invention in any way. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (7)

1. The method for testing the shearing strength of the marine composite steel plate interface is characterized by being tested by utilizing a separated Hopkinson pressure bar, wherein the diameters of an incident rod and a transmission rod in the separated Hopkinson pressure bar are equal, and the testing method mainly comprises the following steps:
designing a sample, a loading piece and a clamping piece, wherein the sample comprises a base layer and a composite layer which are parallel to each other from bottom to top, the base layer and the composite layer are both in a cuboid shape, the length directions of the composite layer and the base layer are the same, the length of the composite layer is smaller than that of the base layer, and one end of the composite layer, which is close to the base layer, is arranged; the loading piece comprises a first threaded part and a punch, wherein the first threaded part is used for connecting the loading piece with the incident rod, and the punch is used for impacting the sample substrate; the clamping piece comprises a second thread part and a sample loading block, the second thread part is used for connecting the clamping piece with the transmission rod, the sample loading block is used for clamping a sample, the shape of the sample loading block is cuboid, a step through groove with the extending direction perpendicular to the length direction of the clamping piece is arranged at one end, away from the second thread part, of the sample loading block, the step through groove comprises a groove I which can accommodate the multiple layers at the upper part and a groove II which can accommodate the base layer at the lower part, and the length of the groove II is larger 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 the punch;
step two, the loading piece and the clamping piece are respectively in threaded connection with an incident rod and a transmission rod of the separated Hopkinson pressure bar, and the sample is placed in a sample loading block;
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 composite layer of the sample and keep the coaxial state;
fourthly, starting a loading system of the separated Hopkinson pressure bar to enable the bullet to impact the incident rod, enabling the punch to impact the base layer of the sample to enable the base layer and the compound layer to be separated at the interface, collecting strain information recorded by strain gauges attached to the incident rod and the projection rod, and respectively calculating the dynamic shear strain rate at the interface in the loading process according to the following formula
Figure FDA0002689742080000011
And dynamic shear strength at the interface τs；
Figure FDA0002689742080000012
Figure FDA0002689742080000013
Wherein, C0The wave velocity of the stress wave in the rod,/sIs the length of the sample,. epsilonRStrain value measured for strain gauge on incident rod, AbIs the cross-sectional area of the incident rod and the emission rod, AsArea of shear load zone for multiple layers in the test specimen, EBIs the elastic modulus, ε, of incident and transmission rodsTStrain values measured for strain gauges on the transmission rod.
2. The method for testing the interfacial shear strength of the marine composite 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 that: l4 is more than or equal to 1.5 XL 2.
3. The method for testing the interfacial shear strength of the marine composite steel plate according to claim 2, wherein the method comprises the following steps: the length L1, width W1 and height H1 of the multilayer are respectively 2cm, 6cm and 2 cm;
the length L2, width W2 and height H2 of the base layer are 8cm, 6cm and 4cm respectively;
the length L3, the width W3 and the height H3 of the groove I are respectively 2.5cm, 14.5cm and 2.5 cm;
the length L4, the width W4 and the height H4 of the groove II are respectively 16cm, 14.5cm and 4.5 cm.
4. The method for testing the interfacial shear strength of the marine composite steel plate according to claim 3, wherein the method comprises the following steps: the distance between the right side wall of the composite layer and the right side wall of the base layer is 5 cm.
5. The method for testing the interfacial shear strength of the marine composite 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 600 HV.
6. The method for testing the interfacial shear strength of the marine composite steel plate according to claim 1, wherein the method comprises the following steps: the hardness of the material adopted by the clamping piece is not lower than 400 HV.
7. The method for testing the interfacial shear strength of the marine composite steel plate according to claim 1, wherein the method comprises the following steps: and 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 composite layer and the side wall of the groove I.
CN202010987518.4A 2020-09-18 2020-09-18 Marine composite steel plate interface shear strength testing method Active CN112229705B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010987518.4A CN112229705B (en) 2020-09-18 2020-09-18 Marine composite steel plate interface shear strength testing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010987518.4A CN112229705B (en) 2020-09-18 2020-09-18 Marine composite steel plate interface shear strength testing method

Publications (2)

Publication Number Publication Date
CN112229705A true CN112229705A (en) 2021-01-15
CN112229705B CN112229705B (en) 2023-06-09

Family

ID=74107039

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010987518.4A Active CN112229705B (en) 2020-09-18 2020-09-18 Marine composite steel plate interface shear strength testing method

Country Status (1)

Country Link
CN (1) CN112229705B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114755096A (en) * 2022-05-11 2022-07-15 天津大学 Dynamic punching shear experimental device and experimental method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203643279U (en) * 2013-12-09 2014-06-11 北京有色金属研究总院 Device for measuring dynamic shearing property of material
CN108204918A (en) * 2018-02-01 2018-06-26 东南大学 A kind of composite material dynamic shear test method
RU2696359C1 (en) * 2018-09-07 2019-08-01 Федеральное государственное бюджетное образовательное учреждение высшего образования "Московский государственный университет имени М.В. Ломоносова" (МГУ) Kit for impact rods for experiments on dynamic shift

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203643279U (en) * 2013-12-09 2014-06-11 北京有色金属研究总院 Device for measuring dynamic shearing property of material
CN108204918A (en) * 2018-02-01 2018-06-26 东南大学 A kind of composite material dynamic shear test method
RU2696359C1 (en) * 2018-09-07 2019-08-01 Федеральное государственное бюджетное образовательное учреждение высшего образования "Московский государственный университет имени М.В. Ломоносова" (МГУ) Kit for impact rods for experiments on dynamic shift

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
S.P.NAWALE ET AL.: "《High strain rate response of A356/Al2O3 Aluminum Alloy MMCs using Split Hopkinson Pressure Bar》", 《INTERNATIONAL RESEARCH JOURNAL OF ENGINEERING AND TECHNOLOGY (IRJET)》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114755096A (en) * 2022-05-11 2022-07-15 天津大学 Dynamic punching shear experimental device and experimental method
CN114755096B (en) * 2022-05-11 2022-11-22 天津大学 Dynamic punching shear experimental device and experimental method

Also Published As

Publication number Publication date
CN112229705B (en) 2023-06-09

Similar Documents

Publication Publication Date Title
CN112229705A (en) Method for testing interface shear strength of marine composite steel plate
Xue et al. Numerical simulations of the ice load of a ship navigating in level ice using peridynamics
Grigoriev et al. A pin-loading tension test for evaluation of thin-walled tubular materials
Seo et al. A study on accumulated damage of steel wedges with dead-rise 10 due to slamming loads
Rolfe et al. Underwater blast loading of partially submerged sandwich composite materials in relation to air blast loading response
Nunomura et al. Plastic deformation and fracture behavior of galvannealed coating
Arora et al. Full-scale air and underwater-blast loading of composite sandwich panels
Kristoffersen et al. Dynamic versus quasi-static loading of X65 offshore steel pipes
Stepka Preliminary investigation of catastrophic fracture of liquid-filled tanks impacted by high-velocity particles
Kwon et al. Impact to Composite Box Containing Water and Baffles
Wang et al. Tensile strain capacity of X80 and X100 welds
Hisette et al. Investigations on the level ice resistance of ships with conventional bow shapes
Soares et al. Progress in the Analysis and Design of Marine Structures: Proceedings of the 6th International Conference on Marine Structures (MARSTRUCT 2017), May 8-10, 2017, Lisbon, Portugal
Minami et al. Local approach to dynamic fracture toughness evaluation
Wu et al. Experimental study of the shear strength of cobalt-rich crusts
Czarnecki A preliminary investigation of dual mode fracture sustained by graphite/epoxy laminates impacted by high-velocity spherical metallic projectiles
Cho et al. Development of a prediction formula for ship resistance in level ice
Kim et al. Evaluation of the Ice Load Acting on an Arctic Offshore Structure With Different Ice Drifting Angle
Anderson Nondestructive testing of offshore structures
Arockiasamy et al. Semisubmersible response to transient ice forces
Barrette et al. Healed cracks in iceberg ice
Daley Performance of Nanocrystalline Coatings Under Combined Impact and Fatigue Loads
Yao et al. Experimental Investigation on Mechanical Property of Hybrid Steel-to-Lattice Joint With Pyramidal Carbon Fiber Truss
Serasli et al. Residual Stress Measurements Using the Contour, Deep-Hole Drilling and Neutron Diffraction Methods in T-Section Specimens
Okuno et al. Creep-fatigue life property of P91 welded piping subjected to bending and torsional moments at high temperature

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant