Fusion360の円環の静的応力解析について

hasikun2
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Fusion360の円環の静的応力解析について

hasikun2
Participant
Participant

タイトルなし.jpg

FusionとSolidWorksで同じように円環の静解析を行ったのですが、fusionの応力分布はSolidWorksのように中心の接点が最大応力にならず、左右に分かれています。なぜなのでしょうか?

ちなみに、アセンブリで「すべての接触を有効にする」をしています。

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adachitech7
Consultant
Consultant

@hasikun2 さん、

 

Solidworksの設定がどのようなものなのかが分からないので何とも言えないところがあるのですが、Fusion360の方で設定をいじることでSolidworksと近い結果がでるようになりました。

 

以下、色々トライした結果です。

 

デフォルト設定

デフォルト.PNG

 

アダプティブメッシュリファインメントを高に設定。

アダプティブ設定.PNGアダプティブ.PNG

 

 

メッシュサイズをモデルベースで3%にする。

メッシュ3%.PNG

 

 

接触設定を接着から粗いに変更。

接触粗い.PNG接触粗い結果.PNG

hasikun2
Participant
Participant

本当にありがとうございます。確かに接触を粗いor分離にすると応力最大値が中心になりました。

しかしもう一つ問題がありまして、応力最大値が高すぎることです。

 

円環(アクリル):外径70mm 内径3mm 押し出し5mm

上下のプレート(炭素鋼):縦10mm×横30mm

力:天面から500N

拘束:底面完全固定・天面Z軸以外固定

 

ざっと上記の条件でSOLIDWORKSFusionで同じ解析を行っているのですが、SOLIDWORKSの場合、メッシュの細かくしても最大値は46MPa程度(デフォでは40MPa)になりますが、fusionの場合、画像でお送りいただいているようにメッシュを細かくすればするほど最大値が爆発します。

 

確かに、同じ材料でもSOLIDWORKSFusionで材料特性が多少異なりますが、ここまで差が出るとは考えにくいです。

一応、円環ではなく円柱になってしまいますが、以下サイトで接触面圧計算してみると40MPa弱だったのでSOLIDWORKSでの解析が正しい結果だと思っているのですが、ご教示いただきたいです。

https://gijyutsu-keisan.com/webapp/mech/calc_hertz/calc.php?sel_graph=cylinder_2

hasikun2
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Participant
訂正 円環の内径は30mmです。
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adachitech7
Consultant
Consultant

@hasikun2 さん、

 

Fusion360では円環との接触部分が特異点として認識されているようですね。

 

応力集中する部分はメッシュサイズを細かくするほど応力値が大きくなって発散するという問題で良く知られた現象のようです。

 

https://www.fasotec.co.jp/625/

 

下図は過去にFusion360で検証してみた結果です。

シャープエッジのところの応力値がメッシュサイズを細かくしていくにしたがって増大しているのが分かります。

01.PNG02.png

 

回避できるやり方がないかトライしてみますので少し待ってください。

その間に良く知っている人から返答があるかもしれません。

hasikun2
Participant
Participant

ありがとうございます。まさにこの現象でした。

自分でも解決方法を模索してみます。

お手数ですが、よろしくお願い申し上げます。

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mizuV4V5F
Contributor
Contributor

@hasikun2 さま

横から失礼します.

 

解析モデルがかなり不安定だと思いましたので,理想的な状態となるように1/8モデルで解析しました.
メッシュの絶対サイズが2.5,1.0,0.5mmの3ケースですが,ミーゼス応力の最大値が爆発することはありませんでした(ばらついてはいますが...).

図1.png図2.png

また,応力特異点が一部分だけであれば無視することもできると思います.
例えば,円_0.5のモデルで鉛直応力の最小値は-110 MPaですが,その範囲は微小で接触の中央では-55 MPa程度です.
図3.png

解析結果の最大・最小だけでなく総合的に評価してみてはいかがでしょうか?

 

以下は,解析モデルに合わせて計算サイトに入力した条件と結果です.
円柱面 直径: 70 mm,接触長さ: 5 mm,縦弾性係数: 2.74 GPa,ポアソン比: 0.355
平面 縦弾性係数: 210 GPa,ポアソン比: 0.3
入力荷重: 500 N
ヘルツ面厚Max: 53.038 MPa
接触面幅: 2.4006 mm

hasikun2
Participant
Participant

詳細なご回答をいただきありがとうございます。

全体図で解析ソフトごとで比較して解析方法をまとめたかったのですが、やはり難しいようですね。

ちなみに、接触方法は接着・粗い・分離等のどれでしょうか?

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hasikun2
Participant
Participant

hasikun2_0-1640763599617.png

よくよく考えてみると円環の応力分布が分かればよかったので、解析終了後、上下のボディーを非表示にしたらそれなりに求めていた値になりました。これは正しい値と言えるでしょうか?

 

ちなみに同じ材料でもSOLIDとFusionで特性が少し違ったので、Solidの特性を「物理マテリアルの管理」から個別に値を指定しています。SOLIDの値↓

hasikun2_1-1640763915689.png

hasikun2_2-1640763965193.png

 

 

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adachitech7
Consultant
Consultant
解決済み

@hasikun2 さん、

 

固定拘束のやり方を変えて接触をスライドにしてみました。

この状態でメッシュサイズを10mmから1mmまで1mm刻みで細かくしています。

これを見ると上部中央の応力値はメッシュサイズが小さくなるにつれて収束しているようなのですが、最大応力は発散している感じですね。

円環部分だけを見ているのですが、最大応力はひとまず無視してもいいんじゃないかなという印象です。

あと上部中央の応力値が20MPa以下になっているのでここをどう判断するかですが、、、

一度この状態で接触を「粗い」に戻してやるとまた違った結果が出るのかもしれません。

答えにはなっていませんが何かの参考になれば幸いです。

メッシュ1mm.PNGメッシュ10mm.PNG画像1.png

mizuV4V5F
Contributor
Contributor

@hasikun2 様

 

接触方法は「分離」にしています.

その他はデフォルトのままだったと思います.

モデルを添付しておりますので,詳細はこちらでご確認ください.

 

別の解析ソフトと比較するならば,なるべく条件を合わせるのがよいかと存じます.

材料定数,形状はもちろんのこと,解析要素,境界条件(接触条件含む)などで結果が変わりますのでご注意ください.

 

製品名を入力してください

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We use NMPI Display to deploy digital advertising on sites supported by NMPI Display. Ads are based on both NMPI Display data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that NMPI Display has collected from you. We use the data that we provide to NMPI Display to better customize your digital advertising experience and present you with more relevant ads. NMPI Display Privacy Policy
VK
We use VK to deploy digital advertising on sites supported by VK. Ads are based on both VK data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that VK has collected from you. We use the data that we provide to VK to better customize your digital advertising experience and present you with more relevant ads. VK Privacy Policy
Adobe Target
We use Adobe Target to test new features on our sites and customize your experience of these features. To do this, we collect behavioral data while you’re on our sites. This data may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, your IP address or device ID, your Autodesk ID, and others. You may experience a different version of our sites based on feature testing, or view personalized content based on your visitor attributes. Adobe Target Privacy Policy
Google Analytics (Advertising)
We use Google Analytics (Advertising) to deploy digital advertising on sites supported by Google Analytics (Advertising). Ads are based on both Google Analytics (Advertising) data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Google Analytics (Advertising) has collected from you. We use the data that we provide to Google Analytics (Advertising) to better customize your digital advertising experience and present you with more relevant ads. Google Analytics (Advertising) Privacy Policy
Trendkite
We use Trendkite to deploy digital advertising on sites supported by Trendkite. Ads are based on both Trendkite data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Trendkite has collected from you. We use the data that we provide to Trendkite to better customize your digital advertising experience and present you with more relevant ads. Trendkite Privacy Policy
Hotjar
We use Hotjar to deploy digital advertising on sites supported by Hotjar. Ads are based on both Hotjar data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Hotjar has collected from you. We use the data that we provide to Hotjar to better customize your digital advertising experience and present you with more relevant ads. Hotjar Privacy Policy
6 Sense
We use 6 Sense to deploy digital advertising on sites supported by 6 Sense. Ads are based on both 6 Sense data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that 6 Sense has collected from you. We use the data that we provide to 6 Sense to better customize your digital advertising experience and present you with more relevant ads. 6 Sense Privacy Policy
Terminus
We use Terminus to deploy digital advertising on sites supported by Terminus. Ads are based on both Terminus data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Terminus has collected from you. We use the data that we provide to Terminus to better customize your digital advertising experience and present you with more relevant ads. Terminus Privacy Policy
StackAdapt
We use StackAdapt to deploy digital advertising on sites supported by StackAdapt. Ads are based on both StackAdapt data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that StackAdapt has collected from you. We use the data that we provide to StackAdapt to better customize your digital advertising experience and present you with more relevant ads. StackAdapt Privacy Policy
The Trade Desk
We use The Trade Desk to deploy digital advertising on sites supported by The Trade Desk. Ads are based on both The Trade Desk data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that The Trade Desk has collected from you. We use the data that we provide to The Trade Desk to better customize your digital advertising experience and present you with more relevant ads. The Trade Desk Privacy Policy
RollWorks
We use RollWorks to deploy digital advertising on sites supported by RollWorks. Ads are based on both RollWorks data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that RollWorks has collected from you. We use the data that we provide to RollWorks to better customize your digital advertising experience and present you with more relevant ads. RollWorks Privacy Policy

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